TOML formatting using pyproject-fmt

[flying-sheep]

Fixes #212

An alternative to #225, see #212 for a comparison

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[grst]

I like it in principle! Shall we wait a bit longer until the biome-pre-commit and pyproject-fmt are maturing a bit more?
How likely is it that pyproject-fmt will become part of ruff?

[flying-sheep]

Shall we wait a bit longer until the biome-pre-commit and pyproject-fmt are maturing a bit more?

I think pyproject-fmt is mature enough, for biome-pre-commit we should maybe wait until someone replies to my comment in biomejs/pre-commit#5

How likely is it that pyproject-fmt will become part of ruff?

it’s a completely separate rust project, and targets a different type of file, so maybe not that likely?

but then again the ruff people have adopted uv and rye so who knows!

[flying-sheep]

Moved the biome part of this to #304

[grst]

I think I'd (slightly) prefer this one over taplo - In addition to the reasons you mentioned it

• doesn't require another .<formatter> config file
• seems to do more stuff that's specific to pyproject.toml, but useful (such as sorting dependencies)

[flying-sheep]

OK! Do you think we should leave it unconfigured (2 spaces indent) or add

[tool.pyproject-fmt]
indent = 4

for the taplo branch, I configured it because the diff would be minimal, but this PR will probably result in

1. the cruft sync failing in all repos using this
2. the pre-commit autofixing reformat the pyproject.toml entirely anyway

[flying-sheep]

Welp, we should decide on indents before next release, but I’m going to merge this