Remove type checker-specific symbols from builtins.pyi and typing.pyi

I'm working to get rid of the type checker-specific symbols that currently are in our core stubs but don't exist at runtime. I'll use this issue to track the work needed. This involves changes both to typeshed and to type checkers.

Affected names:

• typing._TypedDict. Suggesting to rename to _typeshed.TypedDictFallback. (mypy and pyright)
• typing._promote -> _typeshed._promote (mypy only)
• typing.AwaitableGenerator -> _typeshed.AwaitableGenerator (mypy and pyright)
• builtins.function (mypy and pyright). Need to look more into why we can't just use types.FunctionType.
  • Working on this in mypy but it requires updating a ton of test cases
• builtins.ellipsis (mypy and pyright). Should add a new name to _typeshed, similar to NoneType.

builtins.module was also mentioned in the past but it's been fixed already (mypy PR: https://github.com/python/mypy/pull/3107).

Linked issues and PRs:

• #2999
• #3556
• #3932
• python/mypy#11564
• python/mypy#8240
• https://github.com/python/mypy/issues/2765
• https://github.com/python/mypy/issues/8699

Commencez par builtins.pyi et typing.pyi, puis examinez les issues liées de typeshed et du type-checker pour comprendre les remplacements nécessaires. Vérifiez le comportement et les cas de test concernés de mypy et pyright, en particulier les cas de builtins.function. Le travail est terminé lorsque les symboles spécifiques au type-checker ont été supprimés des stubs principaux et que les tests concernés du type-checker passent.