Add control functions to RangingSession

Adds start, stop and reconfigure functions to UWB's RangingSession
along with associated callbacks in RangingSession.Callback.

This change also modifies the UwbManager.openRangingSession function
to only open a ranging session and not actively start ranging. In
order to start ranging, use RangingSession.start() once
RangingSession.Callback.onRangingOpened has been called.

The Ranging Session API now consists of:
  UwbManager.openRangingSession
  RangingSession.start
  RangingSession.stop
  RangingSession.reconfigure
  RangingSession.close

Bug: 173799002
Bug: 170323306
Test: atest UwbManagerTests
Change-Id: I4cc7fbc1bb1cd3b0e75aa9cc57a1ad59d39d6f50