Deprecate typing imports off Dict, List, etc.

[svij-sc]

From Python 3.9 onwards, you can directly use the built-in collection types for type annotations:
i.e.

def process_items(items: list[str]) -> dict[str, int]:

is now possible,
vs before we standardized around

from typing import List, Dict
def process_items(items: List[str]) -> Dict[str, int]:

We should shift away from use of typing module

• Migrate away from List: remove typing.List in favor of list #171
• Migrate away from Dict: Replace typing.Dict with dict #183
• Migrate away from Tuple