Updated the BufferStreamsDemoApp UI to jetpack compose.

The project is no longer using Java and now the MainActivity uses
Kotlin, calling JNI from Kotlin is fairly simiar.

Currently there are 3 empty demo screens, the first demo screen will
call a JNI function but there is no support for logs.

Bug: 296272152
Test: Built and ran on device.
Change-Id: I92f0951899fb6379e1506abdc8e1d67002433787
diff --git a/libs/bufferstreams/examples/app/AndroidManifest.xml b/libs/bufferstreams/examples/app/AndroidManifest.xml
index 872193c..a5e2fa8 100644
--- a/libs/bufferstreams/examples/app/AndroidManifest.xml
+++ b/libs/bufferstreams/examples/app/AndroidManifest.xml
@@ -9,14 +9,15 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.AppCompat.Light"
+        android:theme="@style/Theme.Jetpack"
         tools:targetApi="34">
         <activity
             android:name=".MainActivity"
-            android:exported="true">
+            android:exported="true"
+            android:label="@string/app_name"
+            android:theme="@style/Theme.Jetpack">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>