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. messageType
12. messageUuid
13. path
14. runtimeType
15. size
16. thumbPath
17. time
18. toUserUuidList
19. url
20. width
21. Methods
22. noSuchMethod
23. toString
24. Operators
25. operator ==