[DO NOT MERGE] Fast Pair Half Sheet server side implementation

Refactor doc: go/fp-halfsheet-aosp

Bug: 196262706
Bug: 196644352
Bug: 218771606
Test: Built band verified flow manually
Change-Id: I86d81cd582482889946185a86399ebca21c84e56
7 files changed
tree: c877ca5b686baf44983809d59be661884d97c55a
  1. nearby/