Introduce APIs to support multiple ClusterCIDRs (#108290)

* Introduce networking/v1alpha1 api, ClusterCIDRConfig type

Introduce networking/v1alpha1 api group.

Add `ClusterCIDRConfig` type to networking/v1alpha1 api group, this type
will enable the NodeIPAM controller to support multiple ClusterCIDRs.

* Change ClusterCIDRConfig.NodeSelector type in api

* Fix review comments for API

* Update ClusterCIDRConfig API Spec

Introduce PerNodeHostBits field, remove PerNodeMaskSize

Kubernetes-commit: b9792a9daef4d978c5c30b6d10cbcdfa77a9b6ac

informers/networking/v1alpha1/interface.go

@@ -0,0 +1,45 @@
+/*
+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 informer-gen. DO NOT EDIT.
+
+package v1alpha1
+
+import (
+	internalinterfaces "k8s.io/client-go/informers/internalinterfaces"
+)
+
+// Interface provides access to all the informers in this group version.
+type Interface interface {
+	// ClusterCIDRConfigs returns a ClusterCIDRConfigInformer.
+	ClusterCIDRConfigs() ClusterCIDRConfigInformer
+}
+
+type version struct {
+	factory          internalinterfaces.SharedInformerFactory
+	namespace        string
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
+}
+
+// New returns a new Interface.
+func New(f internalinterfaces.SharedInformerFactory, namespace string, tweakListOptions internalinterfaces.TweakListOptionsFunc) Interface {
+	return &version{factory: f, namespace: namespace, tweakListOptions: tweakListOptions}
+}
+
+// ClusterCIDRConfigs returns a ClusterCIDRConfigInformer.
+func (v *version) ClusterCIDRConfigs() ClusterCIDRConfigInformer {
+	return &clusterCIDRConfigInformer{factory: v.factory, tweakListOptions: v.tweakListOptions}
+}