[Proposal] Add flag --changed-files to mix format

[Dario Heinisch]

Hi,

Running mix format on larger projects can be slow since it checks every file. I don't think there is currently a way to run it on changed files only. Users could run `mix format $(git diff --name-only)` to achieve that but I am wondering whether it might be worth also adding this as a flag directly to mix format. 

I am not sure how this would be implemented. Since the elixir compiler only compiles changed files maybe we could leverage the same code? 

I would be happy to take a look at this if this proposal is accepted.

Best regards,

Dario

[José Valim]

This feature is now in main and it happens automatically.

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