Be able to toggle the raise-hand via external-api (#8838)

* Be able to toggle the raise-hand via external_api

* Code Review inputs

modules/API/API.js

 import { parseJWTFromURLParams } from '../../react/features/base/jwt';
 import JitsiMeetJS, { JitsiRecordingConstants } from '../../react/features/base/lib-jitsi-meet';
 import { MEDIA_TYPE } from '../../react/features/base/media';
-import { pinParticipant, getParticipantById, kickParticipant } from '../../react/features/base/participants';
+import {
+    getLocalParticipant,
+    getParticipantById,
+    participantUpdated,
+    pinParticipant,
+    kickParticipant
+} from '../../react/features/base/participants';
 import { setPrivateMessageRecipient } from '../../react/features/chat/actions';
 import { openChat } from '../../react/features/chat/actions.web';
 import {
             sendAnalytics(createApiEvent('chat.toggled'));
             APP.UI.toggleChat();
         },
+        'toggle-raise-hand': () => {
+            const localParticipant = getLocalParticipant(APP.store.getState());
+
+            if (!localParticipant) {
+                return;
+            }
+            const { raisedHand } = localParticipant;
+
+            sendAnalytics(createApiEvent('raise-hand.toggled'));
+            APP.store.dispatch(
+                participantUpdated({
+                    id: APP.conference.getMyUserId(),
+                    local: true,
+                    raisedHand: !raisedHand
+                })
+            );
+        },
 
         /**
          * Callback to invoke when the "toggle-share-screen" command is received.

modules/API/external/external_api.js

     toggleAudio: 'toggle-audio',
     toggleChat: 'toggle-chat',
     toggleFilmStrip: 'toggle-film-strip',
+    toggleRaiseHand: 'toggle-raise-hand',
     toggleShareScreen: 'toggle-share-screen',
     toggleTileView: 'toggle-tile-view',
     toggleVideo: 'toggle-video'