peer property Null safety

1. millicast_flutter_sdk
2. millicast_flutter_sdk
3. PeerConnection
4. peer property

PeerConnection class

1. Constructors
2. PeerConnection
3. Properties
4. count
5. hashCode
6. peer
7. peerConnectionStats
8. runtimeType
9. sessionDescription
10. Methods
11. addMediaStreamToPeer
12. addPeerEvents
13. addReceiveTransceivers
14. addRemoteTrack
15. clear
16. closeRTCPeer
17. createRTCPeer
18. emit
19. getConnectionState
20. getListenersCount
21. getRTCConfiguration
22. getRTCIceServers
23. getRTCLocalSDP
24. getRTCPeer
25. getRTCPeerStatus
26. getTracks
27. getValidMediaStream
28. initStats
29. instanceRTCPeerConnection
30. isMediaStreamValid
31. noSuchMethod
32. off
33. on
34. removeAllByCallback
35. removeAllByEvent
36. removeListener
37. replaceTrack
38. setRTCRemoteSDP
39. stopStats
40. toString
41. updateBandwidthRestriction
42. updateBitrate
43. Operators
44. operator ==
45. Static methods
46. getCapabilities
47. getTurnServerLocation
48. setTurnServerLocation