[RN] Use _switchCameras provided by lib-jitsi-meet
[RN] Use _switchCameras provided by lib-jitsi-meet

The functionality to use the react-native-webrtc custom API for fast switching
cameras was moved to JitsiLocalTrack in lib-jitsi-meet. Use that.

Ref: https://github.com/jitsi/lib-jitsi-meet/pull/444

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