feat: add ability to run clangd-tidy over source control diffs

[jmpfar]

1. Adds a --line-filter argument support similar to clang tidy. This allows filtering of diagnostics on per file and per line range basis
2. Add clangd-tidy-diff a CLI command similar to clang-tidy-diff, which runs clangd-tidy on all files changed in a unified diff and filters the diagnostics to only contain those from changed lines. This allows easier onboarding for large existing codebases.

[lljbash]

Thank you for your contribution! Unfortunately, I've just completed a major refactor of the codebase. I'll try to merge your changes following the new structure later.

[jmpfar]

Thank you for your contribution! Unfortunately, I've just completed a major refactor of the codebase. I'll try to merge your changes following the new structure later.

Sure, no problem
I integrated my changes to the v1.1.x branch on my fork, tell me if you want me to open new pull requests