feat(patch_set): support git diff application #201

Job	Run time
semver	10s
test (1.70.0)	14s
lint	17s
test (stable)	18s
test (beta)	15s
test (nightly)	15s
replay (rust-lang/rust) / gitdiff	28s
replay (rust-lang/rust) / unidiff	30s
replay (golang/go) / unidiff	15s
replay (llvm/llvm-project) / gitdiff	30s
replay (llvm/llvm-project) / unidiff	30s
replay (torvalds/linux) / unidiff	31s
replay (diffy) / gitdiff	13s
replay (golang/go) / gitdiff	16s
replay (git/git) / unidiff	30s
replay (diffy) / unidiff	15s
replay (git/git) / gitdiff	30s
replay (torvalds/linux) / gitdiff	30s
	6m 27s

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