Merge "Implement Presence Broadcast." into tm-dev am: cc5e806e71

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Nearby/+/17101861

Change-Id: I38d0ae65733103854e5c0500d6d17714aa638996
tree: cab9cb1c34e94bef517e27a229d4c49ecb6174ec
  1. nearby/