Intent to approve PEP 703: making the GIL optional - eviltoast

It’s clear that the overall sentiment is positive, both for the general idea and for PEP 703 specifically. The Steering Council is also largely positive on both. We intend to accept PEP 703, although we’re still working on the acceptance details.

Long-term (probably 5+ years), the no-GIL build should be the only build. We do not want to create a permanent split between with-GIL and no-GIL builds (and extension modules).

Short term, we add the no-GIL build as an experimental build mode, presumably in 3.13 (if it slips to 3.14, that is not a problem