[issue41810] Consider reintroducing `types.EllipsisType` for the sake of typing

[Bas van Beek]

Bas van Beek <bas.vanbeek at hotmail.com> added the comment:

Apparently pyright has some interest in `NoneType` (https://github.com/python/typeshed/pull/4519), so it seems there are already some actual use cases.

In any case, I'm ok with adding `NoneType` and `NotImplementedType` to the PR.

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