xuning / livekitAndroidXuningTest

* implement RegionUrlProvider and Room.prepareConnection

* spotless

* fix test

* ensure signal client uses proper scheme when connecting

* more scheme enforcement

This indicates to linters that this will never return and can mark any code after it as unreachable.

* Signal local audio track feature updates

* Fix npe

* Fix custom audio processing factory

* Add TranscriptionReceived event to track publication

* spotless

* Make setter for LocalTrackPublication.muted public

* spotless

* Fix compile errors with m125

* Update default encryption option values

* Update webrtc to m125.6422.02

* spotless

* Fix setScreenShareEnabled not starting the screen share track

* Increase build memory size

* Expose Participant.Kind information

* spotless

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>