Refactor Java GNSS HAL

Extracts large parts of the GNSS HAL into a central GnssNative class,
which can be faked for testing. This is a large step towards making all
GNSS code unit testable, and allows for more modular HAL configurations.
Begins to break up the GnssLocationProvider god object and pull
functionality out into other classes. Changes include:

-Making GnssCapabilities parcelable so it can be part of the API
-Splitting out the NMEA listener from status listeners, which
substantially reduces the burden of supported NMEA listeners as well as
the amount of GNSS<->AP communication.
-All GNSS listeners now respond properly to HAL restarts.
-Partially extract out emergency call detection.

Bug: 153129152
Test: manual
Change-Id: Idee0d548f38c6adf921cd6c28b5d815bbd366f8a