bpo-43923: Revert "bpo-40185: Refactor typing.NamedTuple (GH-19371)"

[juliusgeo]

This reverts commit a2ec069.

https://bugs.python.org/issue43923

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[JelleZijlstra]

As Guido mentioned on the bug, a full revert doesn't seem like the right answer. In particular, the test_typing and frozenset changes in this PR should stay as is.

Also, if we are to move forward with this, we should:

• Add a NEWS entry
• Add a unit test testing the behavior that the bug asked for.

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