Add mock notifications for terminal app

This commit adds two mock notifications for the terminal app:
1. VmLauncherService foreground notification
  As a foreground service, VmLauncherService should display a
  notification to indicate the service is running.
  Terminal app should pass a Notification to the
  VmLauncherService for the foreground notification
2. Port forwarding notification
  When the VM opens a port, terminal app should send a
  notification for user to allow or deny the request

Bug: 372170751
Test: Install on komodo
Change-Id: Iac0ae70354f984246abcb6af1d650a548d59387d
diff --git a/android/TerminalApp/AndroidManifest.xml b/android/TerminalApp/AndroidManifest.xml
index 105e454..28b5436 100644
--- a/android/TerminalApp/AndroidManifest.xml
+++ b/android/TerminalApp/AndroidManifest.xml
@@ -9,6 +9,7 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE"/>
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
 
     <uses-feature android:name="android.software.virtualization_framework" android:required="true" />