Replace `pyvenv.cfg`'s `home` key with `base-prefix` and `base-exec-prefix`

Feature or enhancement

Proposal:

The home key in pyvenv.cfg is used to specify the directory where the base Python executable is. During the Path Initialization, this directory, and consecutively its parents, is searched for stdlib landmarks to determine sys.base_prefix and sys.base_exec_prefix. Naturally, this isn't ideal, it would be better if pyvenv.cfg contained these values directly.

Proposed plan:

• Update venv to start setting the base-prefix and base-exec-prefix keys in pyvenv.cfg when creating/updating environments
• In getpath, use the base-prefix and base-exec-prefix keys to set the prefixes
• Deprecate specifying home, in pyvenv.cfg

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Beginne damit, die Logik zum Erstellen und Aktualisieren der venv-Umgebung zu lesen, und verfolge dann die Path Initialization in getpath, um zu sehen, wie pyvenv.cfg derzeit sys.base_prefix und sys.base_exec_prefix bestimmt. Lege fest, wie die neuen Schlüssel base-prefix und base-exec-prefix geschrieben und verwendet werden, wie home deprecated wird, und verifiziere sowohl neu erstellte als auch aktualisierte Umgebungen.