[Proposal] Make `Mix.Generator.copy_template/4` to accept `format: true` option

[Aleksei Matiushkin]

Problem: 

when generating files with `Mix.Generator`, one should either be an expert in whitespace, or explicitly run `File.write!(target_file, Code.format_file!(target_file))` after the file has been generated.

Solution:

Accept `format: true` as another option in a call to `Mix.Generator.copy_template/4` (technically, in a call to `Mix.Generator.create_file/2` here https://github.com/elixir-lang/elixir/blob/v1.16.3/lib/mix/lib/mix/generator.ex#L30 which would call `Code.format_string/2` as in here: https://github.com/elixir-lang/elixir/blob/v1.16.3/lib/elixir/lib/code.ex#L1014C17-L1014C32 on content.

If this fits, I can provide a PR.

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—AM

If passed, the resulting file would have been 

  

[José Valim]

We should probably call `format_elixir: true` and that sounds good to me. A PR is welcome!

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[Aleksei Matiushkin]

https://github.com/elixir-lang/elixir/pull/13644