Add the ability to compare branches

[dbollish-stellar]

Summary

Add a tool to repository module that integrates with Azure DevOps APIs to enable comparison of branches

Tools

Develop the following tools with full parameter support, including optional ones:

compare_branches: Search Azure DevOps Wikis for relevant content.

Endpoint: GET https://dev.azure.com/{organization}/{project}/_apis/git/repositories/{repositoryId}/diffs/commits?baseVersion={base}&baseVersionType=branch&targetVersion={target}&targetVersionType=branch&api-version=7.1

Rules

1. Adhere strictly to existing project standards and coding conventions.
2. Ensure each tool exposes all API parameters (required and optional).
3. Use the official Azure DevOps Node API to interact with the APIs.

Special treat

If you follow the rules, you'll get candy!

#Existing Example
This project implements a similar functionality to compare_branches as can be done on the ADO web UI.
I intend to use this to generate release notes and get a definitive list of the differences between the main branch and a release branch.
https://github.com/Elad-Health/azure-devops-mcp/blob/main/src/tools/git.ts