build

tests: split lib/tests to separate create #155

Job	Run time
Build jj-lib without Git support	52s
build (ubuntu-latest)	5m 2s
build (macos-13)	7m 36s
cargo-deny (advisories)	26s
build (macos-14)	4m 1s
Clippy check	2m 31s
build (windows-latest)	10m 13s
cargo-deny (bans licenses sources)	23s
Check protos	34s
build (ubuntu-latest, --all-features)	6m 27s
Check that MkDocs can build the docs	15s
Check that MkDocs can build the docs with latest Python and uv	14s
Check formatting	18s
	38m 52s

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