Remove MediaPlayerEvents duplicate in index.d.ts (#4349)

Currently `index.d.ts` has a duplicate and slightly overlapping
definition of `MediaPlayerEvents` interface.  Although allowed in
Typescript which merges both definitions, it seems to be a needless and
confusing duplication.  This commit removes the duplication and replaces
it with a union of duplicated interface definitions.

index.d.ts

@@ -1555,6 +1555,7 @@ declare namespace dashjs {
         PLAYBACK_PLAYING: 'playbackPlaying';
         PLAYBACK_PROGRESS: 'playbackProgress';
         PLAYBACK_RATE_CHANGED: 'playbackRateChanged';
+        PLAYBACK_SEEK_ASKED: 'playbackSeekAsked';
         PLAYBACK_SEEKED: 'playbackSeeked';
         PLAYBACK_SEEKING: 'playbackSeeking';
         PLAYBACK_STALLED: 'playbackStalled';
@@ -4217,84 +4218,6 @@ declare namespace dashjs {
         export const errors: MediaPlayerErrors;
     }
 
-    interface MediaPlayerEvents {
-        AST_IN_FUTURE: 'astInFuture';
-        BUFFER_EMPTY: 'bufferStalled';
-        BUFFER_LOADED: 'bufferLoaded';
-        BUFFER_LEVEL_STATE_CHANGED: 'bufferStateChanged';
-        BUFFER_LEVEL_UPDATED: 'bufferLevelUpdated';
-        CAN_PLAY: 'canPlay';
-        CAN_PLAY_THROUGH: 'canPlayThrough';
-        CAPTION_RENDERED: 'captionRendered';
-        CAPTION_CONTAINER_RESIZE: 'captionContainerResize';
-        CONFORMANCE_VIOLATION: 'conformanceViolation'
-        DYNAMIC_TO_STATIC: 'dynamicToStatic';
-        ERROR: 'error';
-        EVENT_MODE_ON_RECEIVE: 'eventModeOnReceive';
-        EVENT_MODE_ON_START: 'eventModeOnStart';
-        FRAGMENT_LOADING_COMPLETED: 'fragmentLoadingCompleted';
-        FRAGMENT_LOADING_PROGRESS: 'fragmentLoadingProgress';
-        FRAGMENT_LOADING_STARTED: 'fragmentLoadingStarted';
-        FRAGMENT_LOADING_ABANDONED: 'fragmentLoadingAbandoned';
-        KEY_ADDED: 'public_keyAdded';
-        KEY_ERROR: 'public_keyError';
-        KEY_MESSAGE: 'public_keyMessage';
-        KEY_SESSION_CLOSED: 'public_keySessionClosed';
-        KEY_SESSION_CREATED: 'public_keySessionCreated';
-        KEY_SESSION_REMOVED: 'public_keySessionRemoved';
-        KEY_STATUSES_CHANGED: 'public_keyStatusesChanged';
-        KEY_SYSTEM_SELECTED: 'public_keySystemSelected';
-        KEY_SYSTEM_ACCESS_COMPLETE: 'public_keySystemAccessComplete';
-        KEY_SESSION_UPDATED: 'public_keySessionUpdated';
-        LICENSE_REQUEST_COMPLETE: 'public_licenseRequestComplete';
-        LICENSE_REQUEST_SENDING: 'public_licenseRequestSending';
-        LOG: 'log';
-        MANIFEST_LOADED: 'manifestLoaded';
-        MANIFEST_VALIDITY_CHANGED: 'manifestValidityChanged';
-        METRICS_CHANGED: 'metricsChanged';
-        METRIC_ADDED: 'metricAdded';
-        METRIC_CHANGED: 'metricChanged';
-        METRIC_UPDATED: 'metricUpdated';
-        OFFLINE_RECORD_FINISHED: 'public_offlineRecordFinished';
-        OFFLINE_RECORD_LOADEDMETADATA: 'public_offlineRecordLoadedmetadata';
-        OFFLINE_RECORD_STARTED: 'public_offlineRecordStarted';
-        OFFLINE_RECORD_STOPPED: 'public_offlineRecordStopped';
-        PERIOD_SWITCH_STARTED: 'periodSwitchStarted';
-        PERIOD_SWITCH_COMPLETED: 'periodSwitchCompleted';
-        PLAYBACK_ENDED: 'playbackEnded';
-        PLAYBACK_ERROR: 'playbackError';
-        PLAYBACK_LOADED_DATA: 'playbackLoadedData';
-        PLAYBACK_METADATA_LOADED: 'playbackMetaDataLoaded';
-        PLAYBACK_NOT_ALLOWED: 'playbackNotAllowed';
-        PLAYBACK_PAUSED: 'playbackPaused';
-        PLAYBACK_PLAYING: 'playbackPlaying';
-        PLAYBACK_PROGRESS: 'playbackProgress';
-        PLAYBACK_RATE_CHANGED: 'playbackRateChanged';
-        PLAYBACK_SEEK_ASKED: 'playbackSeekAsked';
-        PLAYBACK_SEEKED: 'playbackSeeked';
-        PLAYBACK_SEEKING: 'playbackSeeking';
-        PLAYBACK_STALLED: 'playbackStalled';
-        PLAYBACK_STARTED: 'playbackStarted';
-        PLAYBACK_TIME_UPDATED: 'playbackTimeUpdated';
-        PLAYBACK_WAITING: 'playbackWaiting';
-        PROTECTION_CREATED: 'public_protectioncreated';
-        PROTECTION_DESTROYED: 'public_protectiondestroyed';
-        REPRESENTATION_SWITCH: 'representationSwitch';
-        TRACK_CHANGE_RENDERED: 'trackChangeRendered';
-        QUALITY_CHANGE_RENDERED: 'qualityChangeRendered';
-        QUALITY_CHANGE_REQUESTED: 'qualityChangeRequested';
-        STREAM_ACTIVATED: 'streamActivated'
-        STREAM_DEACTIVATED: 'streamDeactivated';
-        STREAM_INITIALIZED: 'streamInitialized';
-        STREAM_INITIALIZING: 'streamInitializing';
-        STREAM_TEARDOWN_COMPLETE: 'streamTeardownComplete';
-        STREAM_UPDATED: 'streamUpdated';
-        TEXT_TRACKS_ADDED: 'allTextTracksAdded';
-        TEXT_TRACK_ADDED: 'textTrackAdded';
-        TTML_PARSED: 'ttmlParsed';
-        TTML_TO_PARSE: 'ttmlToParse';
-    }
-
     export interface MediaPlayerFactory {
         create(): MediaPlayerClass;
     }