ctypes overhaul - #6450

close #2364

Summary by CodeRabbit

• New Features

  • Major ctypes revamp: richer simple/array/pointer types, dynamic type creation, improved call/casting/interop, byref/out-parameter and COM/cdecl support; array/pointer slicing and buffer introspection added.
  • Support for extended Python struct format specifiers (PEP 3118).

• Bug Fixes

  • Buffer/descriptor validation now correctly allows scalar (ndim=0) shapes and improves format error checks.

• Refactor

  • Simplified Python-visible bindings and renamed several dunder/accessor exposures; removed legacy ctypes thunk/callback surface.

• Chores

  • Spellchecker vocabulary updated with new terms.

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