[AWARE] Make PeerHandle comparable/hashable

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

(partial cherry-pick of commit 3d33d749)
(cherry-pick of commit 0d49c0dd)

Bug: 68931709
Test: builds, unit test, integration test
Change-Id: I87df50edb948a7afc90e496165013235ddca1e48
Merged-In: Idc59269d4275181ed6d9a793213c681dc4e98134
Merged-In: I6848acda9bfef306b8feaae6987ff18f7bc2e6ec