CameraService: Clean up availability listeners and HAL error codes

- Refactor where availability listeners are called to centralize behavior,
  ensuring that all client creation/destruction invokes the listeners
- Clean up some of the client hierarchy
- Filter error codes from key HAL calls to ensure proper reporting

Bug: 16514157
Bug: 16483222
Change-Id: I59875a865b6a508b47423946c78862da8df34cd1