feat(polls): Add analytics for polls

react/features/analytics/AnalyticsEvents.js

     };
 }
 
+/**
+ * Creates a poll event.
+ * The following events will be created:
+ * - poll.created
+ * - poll.vote.checked
+ * - poll.vote.sent
+ * - poll.vote.skipped
+ * - poll.vote.detailsViewed
+ * - poll.vote.changed
+ * - poll.option.added
+ * - poll.option.moved
+ * - poll.option.removed.
+ *
+ * @param {string} action - The action.
+ * @returns {Object}
+ */
+export function createPollEvent(action) {
+    return {
+        action: `poll.${action}`
+    };
+}
+
 /**
  * Creates an event which indicates that a button in the profile panel was
  * clicked.

react/features/polls/components/AbstractPollAnswer.js

 import { useTranslation } from 'react-i18next';
 import { useDispatch, useSelector } from 'react-redux';
 
+import { sendAnalytics, createPollEvent } from '../../analytics';
 import { getLocalParticipant, getParticipantById } from '../../base/participants';
 import { registerVote } from '../actions';
 import { COMMAND_ANSWER_POLL } from '../constants';
 
         newCheckBoxStates[index] = state;
         setCheckBoxState(newCheckBoxStates);
+        sendAnalytics(createPollEvent('vote.checked'));
     }, [ checkBoxStates ]);
 
     const dispatch = useDispatch();
             answers: checkBoxStates
         });
 
+        sendAnalytics(createPollEvent('vote.sent'));
         dispatch(registerVote(pollId, checkBoxStates));
 
         return false;
 
     const skipAnswer = useCallback(() => {
         dispatch(registerVote(pollId, null));
+        sendAnalytics(createPollEvent('vote.skipped'));
 
     }, [ pollId ]);
 

react/features/polls/components/AbstractPollCreate.js

 import { useTranslation } from 'react-i18next';
 import { useSelector } from 'react-redux';
 
+import { sendAnalytics, createPollEvent } from '../../analytics';
 import { getParticipantDisplayName } from '../../base/participants';
 import { COMMAND_NEW_POLL } from '../constants';
 
     });
 
     const addAnswer = useCallback((i: ?number) => {
-
         const newAnswers = [ ...answers ];
 
+        sendAnalytics(createPollEvent('option.added'));
         newAnswers.splice(typeof i === 'number' ? i : answers.length, 0, '');
         setAnswers(newAnswers);
     });
 
     const moveAnswer = useCallback((i, j) => {
         const newAnswers = [ ...answers ];
-
         const answer = answers[i];
 
+        sendAnalytics(createPollEvent('option.moved'));
         newAnswers.splice(i, 1);
         newAnswers.splice(j, 0, answer);
         setAnswers(newAnswers);
         }
         const newAnswers = [ ...answers ];
 
+        sendAnalytics(createPollEvent('option.removed'));
         newAnswers.splice(i, 1);
         setAnswers(newAnswers);
     });
             question,
             answers: filteredAnswers
         });
+        sendAnalytics(createPollEvent('created'));
 
         setCreateMode(false);
 

react/features/polls/components/AbstractPollResults.js

 import { useTranslation } from 'react-i18next';
 import { useDispatch, useSelector } from 'react-redux';
 
+import { sendAnalytics, createPollEvent } from '../../analytics';
 import { getLocalParticipant, getParticipantById } from '../../base/participants/functions';
 import { retractVote } from '../actions';
 import { COMMAND_ANSWER_POLL } from '../constants';
 
     const [ showDetails, setShowDetails ] = useState(false);
     const toggleIsDetailed = useCallback(() => {
+        sendAnalytics(createPollEvent('vote.detailsViewed'));
         setShowDetails(!showDetails);
     });
 
             answers: new Array(pollDetails.answers.length).fill(false)
         });
         dispatch(retractVote(pollId));
+        sendAnalytics(createPollEvent('vote.changed'));
     }, [ pollId, localId, localName, pollDetails ]);
 
     const { t } = useTranslation();