NERoomChatImageMessage constructor Null safety

1. netease_roomkit
2. netease_roomkit
3. NERoomChatImageMessage
4. NERoomChatImageMessage constructor

NERoomChatImageMessage class

1. Constructors
2. NERoomChatImageMessage
3. Properties
4. displayName
5. extension
6. fromNick
7. fromUserUuid
8. hashCode
9. height
10. md5
11. message
12. messageType
13. messageUuid
14. of
15. path
16. runtimeType
17. size
18. thumbPath
19. time
20. toUserUuidList
21. url
22. width
23. Methods
24. noSuchMethod
25. toString
26. Operators
27. operator *
28. operator ==