rewrite: move_commits: add `MoveCommitsTarget` enum to specify roots … #352

Job	Run time
Build binary artifacts (linux-x86_64-musl)	4m 54s
Build binary artifacts (linux-x86_64-gnu)	4m 47s
Build binary artifacts (linux-aarch64-musl)	5m 51s
Build binary artifacts (linux-aarch64-gnu)	5m 20s
Build binary artifacts (macos-x86_64)	6m 53s
Build binary artifacts (macos-aarch64)	3m 47s
Build binary artifacts (win-x86_64)	7m 21s
	38m 53s

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