feat(improve-api-endpoints): Added available model API

This API endpoint shares the same API token with Dataset API.
It is essential for patching the knowledge base in terms of embedding model.

Related to: #11727

api/controllers/service_api/__init__.py

@@ -8,3 +8,4 @@
 from . import index
 from .app import annotation, app, audio, completion, conversation, file, message, workflow
 from .dataset import dataset, document, hit_testing, segment
+from .workspace import models

api/controllers/service_api/workspace/models.py

@@ -0,0 +1,22 @@
+import logging
+
+from flask_login import current_user  # type: ignore
+from flask_restful import Resource, reqparse  # type: ignore
+from werkzeug.exceptions import Forbidden
+
+from controllers.service_api import api
+from controllers.service_api.wraps import validate_dataset_token
+from core.model_runtime.utils.encoders import jsonable_encoder
+from services.model_provider_service import ModelProviderService
+
+class ModelProviderAvailableModelApi(Resource):
+    @validate_dataset_token
+    def get(self, _, model_type):
+        tenant_id = current_user.current_tenant_id
+
+        model_provider_service = ModelProviderService()
+        models = model_provider_service.get_models_by_model_type(tenant_id=tenant_id, model_type=model_type)
+
+        return jsonable_encoder({"data": models})
+
+api.add_resource(ModelProviderAvailableModelApi, "/workspaces/current/models/model-types/<string:model_type>")