[Task]: Remove support for the typing module

[jrmccluskey]

What needs to happen?

From https://s.apache.org/beam-python-type-hinting-overview: Python Enhancement Proposal 585, first implemented in Python 3.9, deprecates the typing module in favor of subscripting built-in types (tuple, list, dict, set, and type) and collections module types. The typing module itself will eventually have the deprecated functionality removed (no sooner that Python 3.9’s end-of-life in October of 2025.)

This issue will track the work to fully remove the typing module from the Python SDK, which cannot be started until Beam no longer supports Python 3.8 (which reaches EOL in October of 2024.)

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

Issue Components

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