build

cli: add difftastic as diff tool #19296

Job	Run time
Check protos	38s
Build without Git support	1m 14s
build (ubuntu-24.04)	6m 13s
build (ubuntu-24.04-arm)	4m 41s
Codespell	10s
Check formatting	20s
build (macos-13)	7m 26s
build (macos-14)	4m 39s
cargo-deny (advisories)	24s
Run doctests	2m 37s
build (windows-latest)	13m 53s
cargo-deny (bans licenses sources)	24s
build (ubuntu-24.04, --all-features)	7m 19s
Clippy check	2m 44s
Check that MkDocs can build the docs	13s
Check that MkDocs can build the docs with latest Python and uv	12s
	53m 7s

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