Mitiq requires Typing typehint to create batched executor

[natestemen]

Issue Description

Mitiq's Executor class as a method is_batched_executor which indicates whether it has the capability of running multiple circuits with a single call. It knows whether it can do this by looking at the annotation of the python function passed to the Executor upon instantiation.

mitiq/mitiq/executor/executor.py

Lines 355 to 359 in f404e28

	return executor_annotation.get("return") in (
	BatchedType[T] # type: ignore[index]
	for BatchedType in [Iterable, List, Sequence, Tuple]
	for T in QuantumResult.__args__ # type: ignore[attr-defined]
	)

The way this is written requires the annotated return type to use a typing class. We should generalize this code to allow for users to create batched executors while using modern python type-hints using data structure constructors (list, set, tuple, etc).

How to Reproduce

def batched_ex(circuits: list[...]) -> list[float]: ...

ex = mitiq.Executor(batched_ex)

ex.is_batched_executor
>>> False  # this should be True