[AWARE] Make PeerHandle comparable/hashable

Add public equals()/hash() methods to PeerHandle. Allows the handle to
be used across multiple calls/sessions.

(cherry-pick of commit 4454bda0)

Bug: 68931709
Test: builds, unit test, integration test
Change-Id: Id06659a640931585893f21b9ee04982d921fe511
Merged-In: I87df50edb948a7afc90e496165013235ddca1e48