[SB][Screen Chips] Show cast chip even if audio-only casting.

When casting to another device, you can either cast your screen, or just
your audio.
 - When casting just audio, only MediaRouter APIs fire.
 - When casting screen, both MediaRouter APIs and MediaProjection APIs
   fire.
Previously, we were only listening to MediaProjection APIs, so we
weren't showing the cast chip if you're just casting audio. This CL adds
listening to MediaRouter events so that we also show the cast chip if
you're casting just audio.

This gets tricky when casting your screen though, because both the
MediaProjection APIs and the MediaRouter APIs fire when screen casting
but they fire at different times (see b/269975671):
- The MediaRouter APIs fire as soon as you select a device to cast to,
  even if you haven't confirmed you want to start casting.
- The MediaProjection APIs only fire once you've confirmed casting
  should start.
This CL also includes disambiguation logic between these two API surfaces.

Key changes:
1) Adds new MediaRouterRepository, which listens to the existing
   CastController for MediaRouter events.
2) Adds new MediaRouterChipInteractor, which filters those media router
   events down to just active casts.
3) Updates CastToOtherDeviceChipViewModel to listen to the new
   interactor and use either MediaRouter or MediaProjection as the
   datasource, depending on what's available.
2) Updates the stop dialog to have screen-specific strings or generic
   strings, depending on whether MediaProjection is active.

Bug: 332662551
Flag: com.android.systemui.status_bar_screen_sharing_chips

Test: Cast to an audio-only device -> verify cast chip appears. Tap chip
-> verify dialog text is audio-specific. Tap "Stop casting" in dialog ->
verify casting stops.

Test: Cast to an audio-only device, then also start sharing your screen
to an app -> verify the cast-to-other-device chip is replaced by the
share-to-app chip. Tap chip -> verify dialog is about sharing, not
casting. Stop sharing to app -> verify cast-to-other-device chip
re-appears. Tap chip -> verify dialog is about casting.

Test: Cast screen to a device -> verify cast chip appears. Verify timer
doesn't reset between selecting the device and starting casting. Tap
chip -> verify dialog text is screen-specific. Tap "Stop casting" in
dialog -> verify casting stops.

Test: atest MediaRouterRepositoryTest MediaRouterChipInteractorTest
CastToOtherDeviceChipViewModelTest

Change-Id: I4a1c6ea9e1089d3780b6e0a5d6cb88675e6a7aa0

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