Adds message duplication detection in ContextHubEndpointBroker

This CL adds logic to detect duplicate received messages and reject them if the message is in the history within a predefined received time window.

Bug: 395884574
Flag: android.chre.flags.offload_implementation
Test: atest FrameworksServicesTests_contexthub_presubmit

Change-Id: I63bffd946192eb845755b24f6cd682610e928205