[ADD] web_session_auto_close

This commit adds the web_session_auto_close module which purpose is
to is to automatically close the session when the last odoo tab is
closed or when the computer gets in idle mode.

The `timeout` occurs 15 seconds after the tab has been closed or
the computer got idle.

web_session_auto_close/static/src/js/web_client.js

@@ -0,0 +1,24 @@
+odoo.define("web_session_auto_close.WebClient", function(require) {
+    "use strict";
+
+    const WebClient = require("web.WebClient");
+
+    return WebClient.include({
+        dependencies: ["bus_service", WebClient.prototype.dependencies],
+
+        /**
+         * @override
+         */
+        start: function() {
+            const isSessionStillValid = this.call("bus_service", "isSessionStillValid");
+            if (!isSessionStillValid) {
+                window.location = "/web/session/logout";
+                return;
+            }
+            const result = this._super.apply(this, arguments);
+            // We need to ensure that the polling has started as this module relies on that process.
+            this.call("bus_service", "startPolling");
+            return result;
+        },
+    });
+});