add MoveBucket to support moving a sub-bucket from one bucket to anot… #199

Job	Run time
test-linux-arm64-race / test-linux (linux-unit-test-4-cpu-race)	29m 55s
test-linux-arm64 / test-linux (linux-unit-test-1-cpu)	13m 42s
test-linux-arm64 / test-linux (linux-unit-test-2-cpu)	13m 24s
test-linux-arm64 / test-linux (linux-unit-test-4-cpu)	13m 35s
	1h 10m 36s

Provide feedback