[DO NOT MERGE] Add FastPairClient am: bf0f941b7b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Nearby/+/16988152

Change-Id: I8bb5c6991c0c3fdfe7716397ed8d303f2e07d258
tree: b00780d874b22f2147d1eebd1a2ea295fe9eba40
  1. nearby/