feat(song): add -song flag for vocal extraction and lyrics validation #32

Job	Run time
test	55s
lint	25s
docker	34s
build (darwin, amd64, darwin-amd64)	22s
build (windows, amd64, windows-amd64.exe)	22s
build (darwin, arm64, darwin-arm64)	18s
build (linux, amd64, linux-amd64)	12s
build (linux, arm64, linux-arm64)	24s
auto-release	0s
	3m 32s

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