Update BufferHubQueue in preparation for VrFlinger refactor.

- Expose buffer hub queue id to the client. This helpful as an id
  in queue enumeration in the DisplayManager API.
- Address log convention deviations.
- Clean up BufferHub service error paths.
- Clean up queue importing logic to query the service for queue
  parameters to avoid accidental abuse.
- Make spawning consumer queues more efficient in RPC only cases.
- Clean up ConsumerQueue constructor logic; move to pdx::Client
  base class (through BufferHubQueue) instead of pdx::ClientBase.
  ConsumerQueue::Create doesn't make sense as a ConsumerQueue can
  only be created from another queue.

Bug: 36401174
Test: build; run buffer_hub_queue-test
Change-Id: I0530f64ecb514d0f37bb13f9ce201b6ff51502b6