Add git-x extension

[simeg]

git-x is a collection of opinionated Git subcommands that significantly enhance Git workflows through:

• Repository health analysis - Comprehensive health checks with visual indicators for configuration, security risks, and repository issues
• Technical debt analysis - Detailed analysis of code churn, file hotspots, long-lived branches, and large commits to help maintain code quality
• Interactive branch management - Fuzzy-search interface for switching between recent branches with timestamps
• Advanced stash management - Interactive stash operations including apply, delete, branch creation, and patch export
• Automated cleanup - Smart deletion of merged branches with clear feedback

These are only a handful of examples. The extension does a lot more, and it's written in Rust so it's fast ⚡

[ccoVeille]

For lazy, but curious people like me

https://github.com/simeg/git-x