Refactor all remaining create, delete, export, get command to use adapter

Signed-off-by: Somtochi Onyekwere <somtochionyekwere@gmail.com>

cmd/flux/alert_provider.go

@@ -0,0 +1,51 @@
+/*
+Copyright 2021 The Flux 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.
+*/
+
+package main
+
+import (
+	notificationv1 "github.com/fluxcd/notification-controller/api/v1beta1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+// notificationv1.Provider
+
+var alertProviderType = apiType{
+	kind:      notificationv1.ProviderKind,
+	humanKind: "alert provider",
+}
+
+type alertProviderAdapter struct {
+	*notificationv1.Provider
+}
+
+func (a alertProviderAdapter) asClientObject() client.Object {
+	return a.Provider
+}
+
+// notificationv1.Provider
+
+type alertProviderListAdapter struct {
+	*notificationv1.ProviderList
+}
+
+func (a alertProviderListAdapter) asClientList() client.ObjectList {
+	return a.ProviderList
+}
+
+func (a alertProviderListAdapter) len() int {
+	return len(a.ProviderList.Items)
+}