[BLOC] StateStream

[zs-dima]

Maybe bloc.stream.whereState<>() could return StateStream however it could lead to big changes

or maybe IStateObservable could have Stream property instead of StateStream ?

abstract class IStateObservable<T extends Object?> {
  T get state;
  Stream<T> get stream;

or additional layer with Stream property

abstract class IBaseStateObservable<T extends Object?> implements  {
  T get state;
  Stream<T> get stream;