ChatCustomListener constructor Null safety

1. agora_chat_sdk
2. agora_chat_sdk
3. ChatCustomListener
4. ChatCustomListener constructor

ChatCustomListener class

1. Constructors
2. ChatCustomListener
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. onDataReceived
9. toString
10. Operators
11. operator ==