build

Unify alias and default command parsing #17220

Job	Run time
Build jj-lib without Git support	47s
Check formatting	16s
Clippy check	1m 47s
build (ubuntu-latest)	1m 47s
cargo-deny (advisories)	22s
build (macos-13)	1m 46s
Check protos	30s
cargo-deny (bans licenses sources)	21s
Check that MkDocs can build the docs	9s
build (macos-14)	1m 48s
build (windows-latest)	1m 28s
Check that MkDocs can build the docs with latest Python and uv	14s
build (ubuntu-latest, --all-features)	1m 45s
	13m 0s

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