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

plugin/pkg/auth/authorizer/rbac/bootstrappolicy/controller_policy.go

@@ -251,6 +251,7 @@ func buildControllerRoles() ([]rbacv1.ClusterRole, []rbacv1.ClusterRoleBinding)
 			// used for pod eviction
 			rbacv1helpers.NewRule("update").Groups(legacyGroup).Resources("pods/status").RuleOrDie(),
 			rbacv1helpers.NewRule("list", "delete").Groups(legacyGroup).Resources("pods").RuleOrDie(),
+			rbacv1helpers.NewRule("get", "list").Groups(networkingGroup).Resources("clustercidrconfigs").RuleOrDie(),
 			eventsRule(),
 		},
 	})

plugin/pkg/auth/authorizer/rbac/bootstrappolicy/testdata/controller-roles.yaml

@@ -907,6 +907,13 @@ items:
     verbs:
     - delete
     - list
+  - apiGroups:
+    - networking.k8s.io
+    resources:
+    - clustercidrconfigs
+    verbs:
+    - get
+    - list
   - apiGroups:
     - ""
     - events.k8s.io