Web nav mv3 sample (#958)

* implemented webNavigation mv3 sample

* Added mv3 webNavigation API sample

* Changes based on review

api-samples/webNavigation/basic/README.md

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+# chrome.webNavigation
+
+This sample demonstrates using the webNavigation API to send notifications.
+
+## Overview
+
+The extension calls the `chrome.webNavigation.onCompleted.addListener()` event listener to trigger a notification whenever a the user navigates to a new webpage.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Navigate the web with notifications on.

api-samples/webNavigation/basic/manifest.json

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+{
+  "name": "webNavigation API Sample",
+  "version": "2",
+  "description": "A demonstration of the webNavigation API",
+  "background": {
+    "service_worker": "service-worker.js"
+  },
+  "permissions": ["webNavigation", "notifications"],
+  "manifest_version": 3
+}

api-samples/webNavigation/basic/service-worker.js

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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
+//
+//     https://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.
+
+chrome.webNavigation.onCompleted.addListener((details) => {
+  chrome.notifications.create({
+    type: 'basic',
+    iconUrl: 'icon.png',
+    title: 'page loaded',
+    message:
+      'Completed loading: ' +
+      details.url +
+      ' at ' +
+      details.timeStamp +
+      ' milliseconds since the epoch.'
+  });
+});