GeezerVison

This is the last precursor to storing tp_subclasses (and tp_weaklist) on the interpreter state for static builtin types.

Here we add per-type storage on PyInterpreterState, but only for the static builtin types. This involves the following:

• add `PyInterpreterState.types'
  • move PyInterpreterState.type_cache to it
  • add a num_builtins_initialized field
  • add a builtins field (a static array big enough for all the static builtin types)
• add _PyStaticType_GetState() to look up a static builtin type's state
• add PyTypeObject.tp_static_builtin_index (to hold the type's index into PyInterpreterState.types.builtins)

(Adding an extra field to PyTypeObject isn't ideal and I may change it to store the index somewhere else.)

• Issue: [subinterpreters] Static types incorrectly share some objects between interpreters #94673