EventManager constructor Null safety

1. sendbird_sdk
2. event_manager
3. EventManager
4. EventManager constructor

EventManager class

1. Constructors
2. EventManager
3. Properties
4. hashCode
5. runtimeType
6. sdk
7. Methods
8. addChannelHandler
9. addConnectionHandler
10. addSessionHandler
11. addUserHandler
12. cleanUp
13. getChannelHandler
14. getConnectionHandler
15. getSessionHandler
16. getUserHandler
17. noSuchMethod
18. notifyChannelChanged
19. notifyChannelDeleted
20. notifyChannelFrozen
21. notifyChannelHidden
22. notifyChannelMemberCountChange
23. notifyChannelOperatorsUpdated
24. notifyChannelParticiapntCountChanged
25. notifyChannelReadReceiptUpdated
26. notifyChannelThreadUpdated
27. notifyChannelTypingStatusUpdated
28. notifyChannelUnfrozen
29. notifyDeliveryReceiptUpdated
30. notifyFriendsDiscovered
31. notifyInvitationDeclied
32. notifyInvitationReceived
33. notifyMentionReceived
34. notifyMessageDeleted
35. notifyMessageReceived
36. notifyMessageUpdate
37. notifyMetaCountersChanged
38. notifyMetaDataChanged
39. notifyPinUpdated
40. notifyPollDeleted
41. notifyPollUpdated
42. notifyPollVoted
43. notifyReactionUpdated
44. notifyReconnectionCanceled
45. notifyReconnectionFailed
46. notifyReconnectionStarted
47. notifyReconnectionSucceeded
48. notifySessionClosed
49. notifySessionError
50. notifySessionExpired
51. notifySessionRefreshed
52. notifySessionTokenRequired
53. notifyTotalUnreadMessageCountUpdated
54. notifyUserBanned
55. notifyUserEntered
56. notifyUserExited
57. notifyUserJoined
58. notifyUserLeaved
59. notifyUserMuted
60. notifyUserUnbanned
61. notifyUserUnmuted
62. removeChannelHandler
63. removeConnectionHandler
64. removeSessionHandler
65. removeUserHandler
66. toString
67. Operators
68. operator ==