Argument Clinic was added 10 years ago. The script clinic.py grown from around 2500 lines to around 6700 lines.

I propose to split this large file into sub-files to ease the maintenance of Argument Clinic.

Linked PRs

• [DRAFT] gh-113299: Split clinic.py into sub-files #113300
• gh-113299: Create libclinic package #113309
• gh-113299: Move cpp.py into libclinic #113526
• gh-113299: Move Argument Clinic CLI into libclinic #115542