feat(patch_set): support git diff application #190

Job	Run time
semver	6s
lint	11s
test (1.70.0)	25s
test (nightly)	21s
test (stable)	24s
test (beta)	20s
replay (diffy) / unidiff	15s
replay (diffy) / gitdiff	38s
replay (rust-lang/rust) / unidiff	39s
replay (rust-lang/rust) / gitdiff	39s
replay (rust-lang/cargo) / gitdiff	20s
replay (rust-lang/cargo) / unidiff	31s
	4m 49s

Provide feedback