Add a type for TaskEither<L, Option<T>>

[evandrobubiak]

I have been used much a typedef like this and added some util extension.
I use this for API Calls that may return something or not and may fail (bad connection, timout, etc).
Is there something out of the box for this? If not it could be an feature in fpdart.

typedef TaskResultOption<T> = TaskEither<BaseAppException, Option<T>>;

extension TaskResultOptionExtension<T> on TaskResultOption<T> {
  TaskEither<BaseAppException, T> toSomeOrLeft() {
    return flatMap(
      (option) => option.fold(
        () => TaskEither.left(DataNotFoundException()),
        (value) => TaskEither.right(value),
      ),
    );
  }

  TaskEither<BaseAppException, T?> toSomeOrNull() {
    return flatMap(
      (option) => option.fold(
        () => TaskEither.right(null),
        (value) => TaskEither.right(value),
      ),
    );
  }
}