[DO NOT MERGE] Add unit test for fast pair manager

Test: unit test
Bug: 202335820

Change-Id: Ieed334c89b09a1e3525d46d6c6fa8ee92fdef89f
(cherry picked from commit 285d19851f39be9db41c99f36e9f4006250906e1)
4 files changed
tree: f78d8dcc485aafc4e7647161f83700d9ee1f67b6
  1. nearby/