Feature/add new thread to pullrequest

[danielgielowjr-ambevtech]

Description

Adds support for creating new comment threads on Azure DevOps pull requests through the MCP server, including general PR discussions and inline file comments with optional line ranges.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)

Related Issues

Fixes #N/A

Changes Made

• Added create_pull_request_thread MCP tool to create new PR comment threads.
• Implemented Azure DevOps service support for creating general and inline PR threads.
• Added EndLineNumber support to PullRequestThreadDto for inline comment ranges.
• Added unit tests covering successful thread creation and validation scenarios.
• Updated README with the new tool, usage examples, and DTO documentation.

Testing

• I have tested these changes locally
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have updated the documentation accordingly

Screenshots (if applicable)

N/A

Additional Notes

Validated locally with dotnet test: 295 tests passed, 0 failed.