add flag concurrent-statefulset-syncs to kube-controller-manager (#79169)

* add flag `concurrent-statefulset-syncs` to set number of concurrent workers for statefulset controller

* change default value of ConcurrentStatefulSetSyncs from 1 to 5

* 1. fix doc comment of statefulset config types.go
2. add missing deps k8s.io/kubernetes/pkg/controller/statefulset/config

* add missing dep k8s.io/kubernetes/pkg/controller/statefulset/config/v1alpha1

* updated bazel BUILD files

* update kube-controller-manager options testcase

* fix codegen

* fix golint error

* fix testcase

pkg/controller/statefulset/config/v1alpha1/zz_generated.deepcopy.go

@@ -0,0 +1,21 @@
+// +build !ignore_autogenerated
+
+/*
+Copyright The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by deepcopy-gen. DO NOT EDIT.
+
+package v1alpha1