Add RadioModeListener + Robolectric tests

Bluetooth listen to 2 different Radios, we can share the code between
them.
This code is not yet active, the SatelliteModeListener is using it
behind a flag in the follow-up change

Add support for Robolectric to add a full coverage with real use case
and add test in TEST_MAPPING

Test: atest ServiceBluetoothRoboTests | no-op change for outside
Bug: 262605980
Bug: 286602847
Change-Id: I718e12fd0fdc8827cc55f2babb1306bcb29df2d4