feat(external-api) add command for setting camera facing mode (#13541)

- added command for setting the camera facing mode remotely
- enhanced toggleVideo command to optionally accept the facing mode
- fix(startSilent) do not create audio track when start silent

modules/API/external/external_api.js

@@ -54,6 +54,7 @@ const commands = {
     removeBreakoutRoom: 'remove-breakout-room',
     resizeFilmStrip: 'resize-film-strip',
     resizeLargeVideo: 'resize-large-video',
+    sendCameraFacingMode: 'send-camera-facing-mode-message',
     sendChatMessage: 'send-chat-message',
     sendEndpointTextMessage: 'send-endpoint-text-message',
     sendParticipantToRoom: 'send-participant-to-room',
@@ -112,6 +113,7 @@ const events = {
     'data-channel-opened': 'dataChannelOpened',
     'device-list-changed': 'deviceListChanged',
     'display-name-change': 'displayNameChange',
+    'dominant-speaker-changed': 'dominantSpeakerChanged',
     'email-change': 'emailChange',
     'error-occurred': 'errorOccurred',
     'endpoint-text-message-received': 'endpointTextMessageReceived',
@@ -153,7 +155,6 @@ const events = {
     'video-mute-status-changed': 'videoMuteStatusChanged',
     'video-quality-changed': 'videoQualityChanged',
     'screen-sharing-status-changed': 'screenSharingStatusChanged',
-    'dominant-speaker-changed': 'dominantSpeakerChanged',
     'subject-change': 'subjectChange',
     'suspend-detected': 'suspendDetected',
     'tile-view-changed': 'tileViewChanged',