[WIP] Allow syncing to/from a local file #10006

Job	Run time
ormolu	12s
build ucm (ubuntu-20.04)	4m 42s
build ucm (macOS-13)	9m 39s
build ucm (windows-2019)	9m 5s
generate jit source	9s
run interpreter tests (ubuntu-20.04)	1m 7s
run transcripts (ubuntu-20.04)	4m 3s
run interpreter tests (macos-13)	2m 28s
run transcripts (macos-13)	6m 47s
run transcripts (windows-2019)	7m 25s
build jit binary / build jit binary (ubuntu-20.04)	13s
build jit binary / build jit binary (macOS-13)	17s
build jit binary / build jit binary (windows-2019)	19s
test jit / test jit (ubuntu-20.04)	6s
test jit / test jit (macOS-13)	13s
	46m 45s

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