Add git pre-commit hooks for applying formatting to source

[captainsafia]

Our repos formatting currently defaults to the formatting applied by default in VS. This can be cumbersome for users who are working in non-VS editors with the repo or users who disable format on save in their IDE.

We should consider adding a git pre-commit hook that runs dotnet format on modified source files in a particular change set.

[SteveSandersonMS]

Reopening as per #30145