build

cli: add `jj fix` proof of concept #10929

Job	Run time
Check protos	30s
Clippy check	2m 21s
build (ubuntu-latest)	3m 41s
cargo-deny (advisories)	27s
build (macos-14)	2m 51s
Check that MkDocs can build the docs	23s
cargo-deny (bans licenses sources)	23s
Check that MkDocs can build the docs with Poetry 1.3.2	46s
build (windows-latest)	8m 3s
Check formatting	15s
build (ubuntu-latest, --all-features)	4m 37s
	24m 17s

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