GeezerVison

…ters

The code was doing the same as the helper added in pythonGH-111957 but inline.
That resulted in significantly more `.text` for most functions. Refactor
the Arguemnt Clinic converters code to deduplicate a bit while keeping
generated code close to original.

On my Linux x64 box this reduces `.text` by ~6200 bytes in a clang
release build (no PGO or LTO). Performance is flat.

The helper was already exported for `_sqlite3`, update the comment that
it is used in AC generated code as well.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

Co-authored-by: Pieter Eendebak <[email protected]>

# Conflicts:
#	Modules/_ctypes/clinic/_ctypes.c.h
#	Modules/_io/clinic/fileio.c.h
#	Modules/_io/clinic/textio.c.h
#	Modules/_io/clinic/winconsoleio.c.h
#	Modules/_sqlite/clinic/connection.c.h
#	Modules/cjkcodecs/clinic/multibytecodec.c.h
#	Modules/clinic/_dbmmodule.c.h
#	Modules/clinic/_elementtree.c.h
#	Modules/clinic/_gdbmmodule.c.h
#	Modules/clinic/_pickle.c.h
#	Modules/clinic/_testclinic.c.h
#	Modules/clinic/_tkinter.c.h
#	Modules/clinic/arraymodule.c.h
#	Modules/clinic/posixmodule.c.h
#	Modules/clinic/pyexpat.c.h
#	Objects/clinic/memoryobject.c.h
#	Python/clinic/bltinmodule.c.h
#	Python/clinic/sysmodule.c.h

# Conflicts:
#	Modules/_testcapi/clinic/exceptions.c.h