Remove setuptools/pkg_resources

[Avasam]

Closes #12398

[Avasam]

Oh, a stub can't depend on the library it stubs >.<
Since this restriction is in place for security reasons, would it make sense to allow types-Foo to require Foo ?

stub_uploader.metadata.InvalidRequires: Expected dependency setuptools to be listed in setuptools's requires_dist or the sdist's *.egg-info/requires.txt

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

scipy (https://github.com/scipy/scipy)
- scipy/_build_utils/_generate_blas_wrapper.py:31: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+ scipy/_build_utils/tempita/_tempita.py:1041: error: Library stubs not installed for "pkg_resources"  [import-untyped]
+ scipy/_build_utils/tempita/_tempita.py:1041: note: Hint: "python3 -m pip install types-setuptools"
+ scipy/_build_utils/tempita/_tempita.py:1041: note: (or run "mypy --install-types" to install all missing stub packages)
+ scipy/_build_utils/tempita/_tempita.py:1041: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+ scipy/_lib/unuran/get_and_clean_unuran.py:8: error: Library stubs not installed for "pkg_resources"  [import-untyped]

pwndbg (https://github.com/pwndbg/pwndbg)
+ pwndbg/exception.py:51: error: Library stubs not installed for "pkg_resources"  [import-untyped]
+ pwndbg/exception.py:51: note: Hint: "python3 -m pip install types-setuptools"
+ pwndbg/exception.py:51: note: (or run "mypy --install-types" to install all missing stub packages)

paroxython (https://github.com/laowantong/paroxython)
+ paroxython/__init__.py:20: error: Library stubs not installed for "pkg_resources"  [import-untyped]
+ paroxython/__init__.py:20: note: Hint: "python3 -m pip install types-setuptools"
+ paroxython/__init__.py:20: note: (or run "mypy --install-types" to install all missing stub packages)
+ paroxython/__init__.py:20: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports