convert module initialization to use pep 489 slots #4081
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Supersedes #2245
This is a very first draft of starting to support PEP 489, which is necessary if we want module state (instead of static state). I expect this to come in handy in particular for supporting freethreaded Python and subinterpreters.
This is very much a draft of some stuff I started fiddling around with a couple of weeks ago, so not at all reviewable yet. I just don't want to forget I started this, so pushing it.