Add a high-level tuning option for the cyclic GC

[nascheme]

Feature or enhancement

Proposal:

Add PYTHON_GC_STRATEGY as discussed on the Ideas forum.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/add-config-option-to-control-cyclic-garbage-collector-strategy/66125/

Linked PRs

• gh-124771: Add the PYTHON_GC_PRESET env var. #124772