Add TypeGuards to builtins Methods

[George-Ogden]

Start with equality of common classes to see changes in mypy_primer

[github-actions]

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

schema_salad (https://github.com/common-workflow-language/schema_salad)
+ schema_salad/jsonld_context.py: note: In function "pred":
+ schema_salad/jsonld_context.py:53:31: error: Subclass of "str" and "MutableMapping[Any, Any]" cannot exist: would have incompatible method signatures  [unreachable]
+ schema_salad/jsonld_context.py:54:21: error: Statement is unreachable  [unreachable]
+ schema_salad/schema.py: note: In function "get_anon_name":
+ schema_salad/schema.py:433:27: error: Subclass of "str" and "Mapping[Any, Any]" cannot exist: would have incompatible method signatures  [unreachable]
+ schema_salad/schema.py:434:17: error: Statement is unreachable  [unreachable]

xarray (https://github.com/pydata/xarray)
+ .../projects/_xarray_venv/lib/python3.13/site-packages/pandas-stubs/io/formats/style.pyi:17: note: ... from here,
+ .../projects/_xarray_venv/lib/python3.13/site-packages/pandas-stubs/core/frame.pyi:176: note: ... from here,
+ .../projects/_xarray_venv/lib/python3.13/site-packages/pandas-stubs/_typing.pyi:36: note: ... from here,
+ xarray/core/extension_array.py:27: note: ... from here:

sympy (https://github.com/sympy/sympy)
+ sympy/diffgeom/diffgeom.py:2261: error: Definition of "__contains__" in base class "_deprecated_container" is incompatible with definition in base class "list"  [misc]

urllib3 (https://github.com/urllib3/urllib3)
+ src/urllib3/_collections.py:196: error: Signature of "__contains__" incompatible with supertype "builtins.set"  [override]
+ src/urllib3/_collections.py:196: note:      Superclass:
+ src/urllib3/_collections.py:196: note:          def __contains__(self, object, /) -> TypeGuard[tuple[str, str]]
+ src/urllib3/_collections.py:196: note:      Subclass:
+ src/urllib3/_collections.py:196: note:          def __contains__(self, object, /) -> bool

mkdocs (https://github.com/mkdocs/mkdocs)
+ mkdocs/utils/templates.py:47: error: Subclass of "ExtraScriptValue" and "str" cannot exist: would have incompatible method signatures  [unreachable]

django-stubs (https://github.com/typeddjango/django-stubs)
+ django-stubs/test/utils.pyi:36: error: Signature of "__contains__" incompatible with supertype "builtins.list"  [override]
+ django-stubs/test/utils.pyi:36: note:      Superclass:
+ django-stubs/test/utils.pyi:36: note:          def __contains__(self, object, /) -> TypeGuard[dict[str, Any]]
+ django-stubs/test/utils.pyi:36: note:      Subclass:
+ django-stubs/test/utils.pyi:36: note:          def __contains__(self, object, /) -> bool