feat: add rebalance controller of v2alpha2 #2859

Job	Run time
lint	3m 32s
lint	3m 32s
unit-test	5m 22s
unit-test	4m 39s
e2e-test (e2e/v1beta4/e2e_upgrade_test.go)	5m 48s
e2e-test (e2e/v1beta4/e2e_upgrade_test.go)	5m 48s
e2e-test (e2e/v1beta4/e2e_base_test.go)	8m 56s
e2e-test (e2e/v1beta4/e2e_base_test.go)	8m 56s
e2e-test (e2e/v1beta4/e2e_blure_green_upgrade_test.go)	6m 36s
e2e-test (e2e/v1beta4/e2e_blure_green_upgrade_test.go)	6m 36s
e2e-test (e2e/v2alpha2/e2e_rebalance_test.go)	4m 3s
e2e-test (e2e/v2alpha2/e2e_rebalance_test.go)	4m 3s
e2e-test (e2e/v2alpha2/e2e_test.go)	9m 10s
e2e-test (e2e/v2alpha2/e2e_test.go)	9m 10s
codecov	0s
codecov	4s
	1h 26m 15s

Provide feedback