message: Add custom type Transition
diff: -from typing import List, Tuple
  +from typing import Any, List, Tuple
  from numpy import ndarray
  @@ -10,3 +10,5 @@ FederatedDatasetSplit = Tuple[ndarray, ndarray]
  FederatedDataset = Tuple[List[FederatedDatasetSplit], FederatedDatasetSplit]
  FnameNDArrayTuple = Tuple[str, ndarray]
  +
  +Transition = Tuple[ndarray, Any, float, ndarray, bool]
  