Add a settings entry that enables dartfmt style fixes

[pschiffmann]

style fixes were added to dart_style in version 1.1.0. It would be great if I could opt-in to these in VS Code.

[DanTup]

This will need some support from the Dart analysis server in the SDK before we can add it here.

@bwilkerson do you know if this is planned?

[bwilkerson]

We have not discussed the possibility of supporting running dartfmt with the fix option.

For what it's worth, I'll point out that all of the fixes that it implements are also supported as quick-assists in server. That's less automated than many users want, but also more modular (in the sense that users can choose which set of changes to make).

We have discussed various ways of making server's quick assists and quick fixes more automated. For example, we have discussed having an "apply everywhere" option. Unfortunately, we have not yet implemented that.

[DanTup]

Fixing all instances of a problem would definitely be a neat help (dart-lang/sdk#32474).

I was thinking maybe we could implement auto-fixing editor-side but I don't think we could currently get all the required fixes in a fast way (I guess it's similar to dart-lang/sdk#32462) so this probably would need at least some work in the server.

[DanTup]

When using the LSP preview with a recent enough SDK (note: this doesn't currently include stable channels, though it will make its way there in the next stable releases) you can now apply many fixes to the whole file:

https://dartcode.org/releases/v3-17/#lsp-apply-all-fixes

This isn't exactly what was asked for here, though perhaps it satisfies the original requirement. @pschiffmann let me know if you think otherwise. Thanks!

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