bloc library Null safety

Classes

ErrorFriendState
FriendBloc
FriendCreateSuccess
FriendEvent
FriendLoading
Initialized
FriendLoadSuccess
FriendState
FriendUpdateSuccess
InitFriendEvent
QueryFriendAddressEvent
QueryFriendEvent
QueryFriendNearbyEvent
UnFriendState
UnInitialized
UpdateFriendNearbyEvent
UploadFriendAddressEvent