feat(api) expose follow me method (#9486)

modules/API/API.js

 import {
     getCurrentConference,
     sendTones,
+    setFollowMe,
     setPassword,
     setSubject
 } from '../../react/features/base/conference';
 
             APP.store.dispatch(sendTones(tones, duration, pause));
         },
+        'set-follow-me': value => {
+            logger.debug('Set follow me command received');
+
+            if (value) {
+                sendAnalytics(createApiEvent('follow.me.set'));
+            } else {
+                sendAnalytics(createApiEvent('follow.me.unset'));
+            }
+
+            APP.store.dispatch(setFollowMe(value));
+        },
         'set-large-video-participant': participantId => {
             logger.debug('Set large video participant command received');
             sendAnalytics(createApiEvent('largevideo.participant.set'));

modules/API/external/external_api.js

     sendChatMessage: 'send-chat-message',
     sendEndpointTextMessage: 'send-endpoint-text-message',
     sendTones: 'send-tones',
+    setFollowMe: 'set-follow-me',
     setLargeVideoParticipant: 'set-large-video-participant',
     setTileView: 'set-tile-view',
     setVideoQuality: 'set-video-quality',