[WIP] Add internal class GitInformation for Git details

[Copilot]

Implementation Plan for GitInformation Class

• Create internal GitInformation class in src/LinkDotNet.StringBuilder
  • Add properties for CurrentTag, ShortSha, LongSha, and BranchName
  • Implement logic to retrieve git information using Process to run git commands
  • Add fallback to use Microsoft.SourceLink.GitHub information if git commands fail
  • Handle cases where git is not available
• Create comprehensive unit tests for GitInformation class
  • Test successful retrieval of git information
  • Test fallback scenarios
  • Test error handling
• Build and test the changes
  • Run dotnet build to ensure no compilation errors
  • Run dotnet test to ensure all tests pass
• Code review and security check
  • Request code review
  • Run CodeQL security checker

Original prompt

I want to have a new internal class GitInformation. Ideally with zero configuration and setup from the user.
I want the current tag (if the current hash is associated with one), sha in short and long sha. Name of the branch.
If nothing works you can fallback to "Microsoft.SourceLink.*" package.

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