Help developers setup git-blame for Frameworks modules

See @ivan's comment from the clang-format tracking issue:

It would be cool to automatically do git config --add blame.ignoreRevsFile .git-blame-ignore-revs if there's a .git-blame-ignore-revs file in the repository - so that we can put clang-format commits to be automatically ignored when doing git blame.

I imagine we'd want to gate this behind a config for users who are uncomfortable with any git-config manipulation but for the rest of us this seems it would improve the developer experience.