Add Support for Parsing .xctestrun file and use it to start xctest

[bahrimootaz]

Description:
This pull request introduces enhancements to the go-ios tool by adding the ability to parse .xctestrun files, enabling seamless execution of XCTest. The key updates include:

Key updates include:

1. Parsing .xctestrun File:

• A new parseFile method has been implemented to extract test configuration details from the .xctestrun file.
• The parsed data includes all details needed to execute an xctest like TestHostBundleIdentifier, TestBundlePath, OnlyTestIdentifiers, SkipTestIdentifiers, IsUITestBundle, CommandLineArguments, EnvironmentVariables, and TestingEnvironmentVariables of the xctestrun file.
• Added a validation step to ensure the FormatVersion of the .xctestrun file is supported. Currently, only FormatVersion 1 is accepted, with clear error messages for unsupported versions.

2. Enhanced CLI Command:

• Introduced a new ios runxctest command in the CLI with updated explanations for better usability.
• Allows users to specify xctestrun file path and output preferences.

3. Improved Test Coverage:

• Added test cases to validate parsing of .xctestrun file.
• Ensured robust assertions for critical fields like TestHostBundleIdentifier and TestBundlePath.

These updates simplify and enhance the process of running XCTest by directly utilizing .xctestrun files, reducing manual setup and ensuring better adaptability to diverse testing scenarios.

[bahrimootaz]

@danielpaulus We’d appreciate your review on this PR as it’s our first milestone toward supporting .xctestrun files for starting tests, similar to how Xcode does.