[Proposal] Add flag to `mix format` to specify timeout

[Marc Noordman]

We have a large Elixir project that runs `mix format --check-formatted` in the CI pipeline.

Unfortunately this command sometimes times out, due to project size and server load. 

This makes our CI pipeline result unreliable.

It turns out that there is a hard-coded 30 second timeout for mix format specified in 

https://github.com/elixir-lang/elixir/blob/main/lib/mix/lib/mix/tasks/format.ex

on line 228. 

My proposal would be to make the timeout duration customizable with an optional flag to `mix format`, so we can do something like

`mix format --check-formatted --timeout 300`

to give mix format 5 minutes instead of 30 seconds to check the code. The default, when the flag not provided, should still be to time out after 30 seconds. 

[José Valim]

Timeout bumped to infinity on both main and v1.14.

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