[3.13] gh-117142: Support Importing ctypes in Isolated Interpreters (gh-120008)

This makes the support official.

(cherry picked from commit dba7a167dbbd50e83e58df351f3414b7a08e0188, AKA gh-119991)

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>