ctypes: Deprecate SetPointerType() and ARRAY() functions

The ctypes module has two undocumented functions: SetPointerType() and ARRAY(). These functions are marked as XXX Deprecated, but only in comments.

I propose to deprecate ctypes.SetPointerType() and ctypes.ARRAY() by emitting a DeprecationWarning warning.

These functions are not documented and not used in Python, but there are tested.

Linked PRs

• gh-105733: Deprecate ctypes SetPointerType() and ARRAY() #105734
• gh-105733: Fix ctypes What's New entry #106576
• gh-105733: Soft-deprecate ctypes.ARRAY, rather than hard-deprecating it. #122281
• [3.13] gh-105733: Soft-deprecate ctypes.ARRAY, rather than hard-deprecating it. (GH-122281) #122440