feat: samples for upcoming Istio tutorial (#804)

* Kubernetes manifest files for Istio tutorial

* Added License headers

* Move files to service-mesh/istio-tutorial dir

* Add region tags

service-mesh/istio-tutorial/README.md

@@ -0,0 +1,8 @@
+# Secure Kubernetes Services with Istio on GKE Autopilot
+
+[![Open in Cloud Shell](https://gstatic.com/cloudssh/images/open-btn.svg)](https://ssh.cloud.google.com/cloudshell/editor?cloudshell_git_repo=https://github.com/GoogleCloudPlatform/kubernetes-engine-samples&cloudshell_workspace=autopilot/istio-tutorial)
+
+This example shows how to deploy a Istio service mesh
+to securely deploy of a Bank of Anthos sample application
+with enabled mTLS on using [Google Kubernetes Engine](https://cloud.google.com/kubernetes-engine)
+in Autopilot mode.

service-mesh/istio-tutorial/kiali.yaml

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+# Copyright 2023 Google LLC
+#
+# 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.
+
+# [START gke_service_mesh_istio_kiali_dashboard]
+apiVersion: kiali.io/v1alpha1
+kind: Kiali
+metadata:
+  name: kiali
+  namespace: istio-system
+spec:
+  deployment:
+    namespace: istio-system
+  auth:
+    strategy: anonymous
+  external_services:
+    custom_dashboards:
+      prometheus:
+        url: "http://frontend.monitoring:9090/"
+        auth:
+          type: none
+    prometheus:
+      url: "http://frontend.monitoring:9090/"
+      auth:
+        type: none
+    tracing:
+      enabled: false
+    grafana:
+      enabled: false
+# [END gke_service_mesh_istio_kiali_dashboard]

service-mesh/istio-tutorial/peer-authentication.yaml

@@ -0,0 +1,23 @@
+# Copyright 2023 Google LLC
+#
+# 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.
+
+# [START gke_service_mesh_istio_mtls]
+apiVersion: security.istio.io/v1beta1
+kind: PeerAuthentication
+metadata:
+  name: default
+spec:
+  mtls:
+      mode: STRICT
+# [END gke_service_mesh_istio_mtls]

service-mesh/istio-tutorial/pod-monitorings.yaml

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+# Copyright 2023 Google LLC
+#
+# 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.
+
+# [START gke_service_mesh_istio_monitoring]
+apiVersion: monitoring.googleapis.com/v1
+kind: PodMonitoring
+metadata:
+  name: istiod
+  namespace: istio-system
+spec:
+  selector:
+    matchLabels:
+      app: istiod
+  endpoints:
+  - port: 15014
+    path: /metrics
+    timeout: 30s
+    interval: 60s
+# [END gke_service_mesh_istio_monitoring]
+---
+# [START gke_service_mesh_istio_containers_envoy_proxies_monitoring]
+apiVersion: monitoring.googleapis.com/v1
+kind: PodMonitoring
+metadata:
+  name: envoy-proxies
+  namespace: default
+spec:
+  selector:
+    matchLabels:
+      application: bank-of-anthos
+  endpoints:
+  - port: 15020
+    path: /metrics
+    timeout: 30s
+    interval: 60s
+# [END gke_service_mesh_istio_containers_envoy_proxies_monitoring]