[Audiosharing] When landscape mode, collapse app bar to make more space. Also refined fragments and make them scrollable.

Bug: b/356302527, b/356300387, b/356297148
Flag: com.android.settingslib.flags.enable_le_audio_qr_code_private_broadcast_sharing
Test: atest
Change-Id: I5d94f0d05afc78c13cab5b75ad662af72ffa0350

src/com/android/settings/connecteddevice/audiosharing/audiostreams/AudioStreamsQrCodeFragment.java

@@ -61,6 +61,8 @@ public class AudioStreamsQrCodeFragment extends InstrumentedFragment {
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
+        // Collapse or expand the app bar based on orientation for better display the qr code image.
+        AudioStreamsHelper.configureAppBarByOrientation(getActivity());
         var unused = ThreadUtils.postOnBackgroundThread(
                 () -> {
                     BluetoothLeBroadcastMetadata broadcastMetadata = getBroadcastMetadata();