[2/N][Requesting Handoff From App] Create HandoffRequestResultMessage

This is part of a stack of changes to send requests for Handoff to connected associations and process response messages into actual app launches

This change adds a response message class, to receive Handoff information from another device. As part of this change, serialization of TaskContinuityMessages has been updated to throw exceptions from HandoffActivityData serialization

Test: Added unit tests
Bug: 400970610
Flag: android.companion.enable_task_continuity
Change-Id: Ia4eaac89d9424504434ac8d9bd26457eda172a2c