xuning / livekitAndroidXuningTest

This reverts commit 879ddb3b.

* KDocs for undocumented methods

* More KDocs

* spotless

* Cache target zoom value for more accuracy while zooming

* spotless

* Call CameraSession.Events.onCameraClosed when session stops

* Documentation for ScaleZoomHelper

* Rename getCameraProvider to createCameraProvider to clarify behavior

* Clean up and example gesture zoom feature

* spotless

* fix build

* Allow registration of external cameras implementations

* CameraX sample integration

* create livekit-android-camerax module

* spotless

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Co-authored-by: davidliu <davidliu@deviange.net>

* Allow setting of degradation preference

* fix tests

* spotless

* Render video directly from capturer for local video tracks

* spotless

* Add some audio convenience functions

* Fix tests

* Add camera/mic service types to sample foreground service

* spotless

* Separate mocks and tests into separate package

* publishing for testing package

* Make NetworkCallbackManager injectable

* various fixes and upgrades to test package

* fix tests

* Sanitize response handling and clear out queued requests upon disconnection

* cleanup test code

* spotless

* More sanitization

* Fix tests