Add fullTracking to registerGnssMeasurementsCallback (implementation)

- Currently enableFullTracking has a toggle in Developer Option.
This change adds a system API for the same functionality.
- If at least one of <enableFullTracking in Developer Option> and
<enableFullTracking from the system API> is true, full tracking is
enabled when registering a GnssMeasurement callback.
- For multiple GnssMeasurement callbacks, full tracking is enabled
if *at least* one callback has fullTracking enabled. Removing a callback
might trigger restarting the measurement collection if the aggregated
requirement has changed.

Bug: 147387008

Test: atest GnssMeasurementsProviderTest
      atest GnssManagerServiceTest
      atest GnssMeasurementRegistrationTest

Change-Id: Iedf03edd7053aa0089cfea0d5c0357322f68d9c4