.Net: Moving VectorStore DI extensions to core namespace. (#7953)

### Motivation and Context

The DI extensions for other connectors are in the
`Microsoft.SemanticKernel` namespace, so moving the VectorStore ones as
well.

### Description

Moving the dependency injection framework extensions into the
`Microsoft.SemanticKernel` namespace.

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

dotnet/src/Connectors/Connectors.AzureAISearch.UnitTests/AzureAISearchServiceCollectionExtensionsTests.cs

@@ -5,6 +5,7 @@
 using Azure.Core;
 using Azure.Search.Documents.Indexes;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel;
 using Microsoft.SemanticKernel.Connectors.AzureAISearch;
 using Microsoft.SemanticKernel.Data;
 using Moq;

dotnet/src/Connectors/Connectors.Memory.AzureAISearch/AzureAISearchKernelBuilderExtensions.cs

@@ -4,9 +4,10 @@
 using Azure;
 using Azure.Core;
 using Azure.Search.Documents.Indexes;
+using Microsoft.SemanticKernel.Connectors.AzureAISearch;
 using Microsoft.SemanticKernel.Data;
 
-namespace Microsoft.SemanticKernel.Connectors.AzureAISearch;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Azure AI Search <see cref="IVectorStore"/> instances on the <see cref="IKernelBuilder"/>.

dotnet/src/Connectors/Connectors.Memory.AzureAISearch/AzureAISearchServiceCollectionExtensions.cs

@@ -5,9 +5,10 @@
 using Azure.Core;
 using Azure.Search.Documents.Indexes;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel.Connectors.AzureAISearch;
 using Microsoft.SemanticKernel.Data;
 
-namespace Microsoft.SemanticKernel.Connectors.AzureAISearch;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Azure AI Search <see cref="IVectorStore"/> instances on an <see cref="IServiceCollection"/>.

dotnet/src/Connectors/Connectors.Memory.Pinecone/PineconeKernelBuilderExtensions.cs

@@ -1,9 +1,10 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using Microsoft.SemanticKernel.Connectors.Pinecone;
 using Microsoft.SemanticKernel.Data;
 using Sdk = Pinecone;
 
-namespace Microsoft.SemanticKernel.Connectors.Pinecone;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Pinecone <see cref="IVectorStore"/> instances on the <see cref="IKernelBuilder"/>.

dotnet/src/Connectors/Connectors.Memory.Pinecone/PineconeServiceCollectionExtensions.cs

@@ -1,10 +1,11 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel.Connectors.Pinecone;
 using Microsoft.SemanticKernel.Data;
 using Sdk = Pinecone;
 
-namespace Microsoft.SemanticKernel.Connectors.Pinecone;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Pinecone <see cref="IVectorStore"/> instances on an <see cref="IServiceCollection"/>.

dotnet/src/Connectors/Connectors.Memory.Qdrant/QdrantKernelBuilderExtensions.cs

@@ -1,9 +1,10 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using Microsoft.SemanticKernel.Connectors.Qdrant;
 using Microsoft.SemanticKernel.Data;
 using Qdrant.Client;
 
-namespace Microsoft.SemanticKernel.Connectors.Qdrant;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Qdrant <see cref="IVectorStore"/> instances on the <see cref="IKernelBuilder"/>.

dotnet/src/Connectors/Connectors.Memory.Qdrant/QdrantServiceCollectionExtensions.cs

@@ -1,10 +1,11 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel.Connectors.Qdrant;
 using Microsoft.SemanticKernel.Data;
 using Qdrant.Client;
 
-namespace Microsoft.SemanticKernel.Connectors.Qdrant;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Qdrant <see cref="IVectorStore"/> instances on an <see cref="IServiceCollection"/>.

dotnet/src/Connectors/Connectors.Memory.Redis/RedisKernelBuilderExtensions.cs

@@ -1,9 +1,10 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using Microsoft.SemanticKernel.Connectors.Redis;
 using Microsoft.SemanticKernel.Data;
 using StackExchange.Redis;
 
-namespace Microsoft.SemanticKernel.Connectors.Redis;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Redis <see cref="IVectorStore"/> instances on the <see cref="IKernelBuilder"/>.

dotnet/src/Connectors/Connectors.Memory.Redis/RedisServiceCollectionExtensions.cs

@@ -1,10 +1,11 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel.Connectors.Redis;
 using Microsoft.SemanticKernel.Data;
 using StackExchange.Redis;
 
-namespace Microsoft.SemanticKernel.Connectors.Redis;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Redis <see cref="IVectorStore"/> instances on an <see cref="IServiceCollection"/>.

dotnet/src/Connectors/Connectors.Qdrant.UnitTests/QdrantServiceCollectionExtensionsTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel;
 using Microsoft.SemanticKernel.Connectors.Qdrant;
 using Microsoft.SemanticKernel.Data;
 using Qdrant.Client;

dotnet/src/Connectors/Connectors.Redis.UnitTests/RedisServiceCollectionExtensionsTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel;
 using Microsoft.SemanticKernel.Connectors.Redis;
 using Microsoft.SemanticKernel.Data;
 using Moq;

dotnet/src/Connectors/Connectors.UnitTests/Memory/Pinecone/PineconeServiceCollectionExtensionsTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel;
 using Microsoft.SemanticKernel.Connectors.Pinecone;
 using Microsoft.SemanticKernel.Data;
 using Xunit;

dotnet/src/SemanticKernel.Core/Data/KernelBuilderExtensions.cs

@@ -1,8 +1,9 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using System.Diagnostics.CodeAnalysis;
+using Microsoft.SemanticKernel.Data;
 
-namespace Microsoft.SemanticKernel.Data;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Data services on the <see cref="IKernelBuilder"/>.

dotnet/src/SemanticKernel.Core/Data/ServiceCollectionExtensions.cs

@@ -2,8 +2,9 @@
 
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel.Data;
 
-namespace Microsoft.SemanticKernel.Data;
+namespace Microsoft.SemanticKernel;
 
 /// <summary>
 /// Extension methods to register Data services on an <see cref="IServiceCollection"/>.

dotnet/src/SemanticKernel.UnitTests/Data/ServiceCollectionExtensionsTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.SemanticKernel;
 using Microsoft.SemanticKernel.Data;
 using Xunit;