Refactor Fast Pair provider side.

Test: atest -v CtsSeekerDiscoverProviderTest
Test: m NearbyFastPairProviderSimulatorApp, check the app can work
BUG: 216079944
Change-Id: I439cb5a453fc5e73f3d213a7d4e02ffd3366184b
18 files changed
tree: 5fa44676f3c81ae022a46ac5d35d34931aa1cb51
  1. nearby/