psc: Add ProcessReceiverRecordInternal

This change extracts the  broadcast receiver state management from
ProcessReceiverRecord into a new internal base class,
ProcessReceiverRecordInternal.

Bug: 425766486
Test: m services.core
Test: atest MockingOomAdjusterTests OomAdjusterTests
Test: atest FrameworksServicesTestsRavenwood_ProcessStateController
Flag: EXEMPT pure refactor
Change-Id: I39bdb4945ff3721e4cea4fc7edfe57c270af5c90