Telescope!

Add a composable for managing a simulation listener.
Since it's a tool for observing the universe, it's a Telescope.

Rename VisibleUniverse composable to UniverseCanvas for clarity.

Fix telemetry not updating by using a Telescope to invalidate the
top-level recompose scope for now; this can be narrowed later.

Bug: 373855388
Test: adb shell am start -n com.android.egg/.landroid.MainActivity
Flag: com.android.egg.flags.flag_flag
Change-Id: I68b85652eb3ced269b56ee543c045710e875ff6b