Address GNSS VTS code duplication (part 1)

-Moved GNSS callback event queue class from VTS 2.0 code
 into common library that is shared with all GNSS VTS tests.
-Modified VTS 1.1 code to reuse GNSS callback event queue in
 order to address potential issues noted in b/131869042 and
 also to later extract common code from VTS 1.1 and VTS 2.0
 into common library.

Bug: 136515339
Test: atest VtsHalGnssV2_0TargetTest
      atest VtsHalGnssV1_1TargetTest

Change-Id: I9356e7653f9784a9149b2c2bd6307750e9cc56b3