[Rpm-maint] [rpm-software-management/rpm] RFE: Use Python Stable ABI for the bindings (Issue #2345)

[Petr Viktorin]

> the module, and its types, can only be initialized once per process

For reference, the Python version where this limitation can be lifted *relatively easily* is 3.10 (which adds API for type/module association, like [PyType_GetModule](https://docs.python.org/3/c-api/type.html?highlight=pytype_getmodule#c.PyType_GetModule)). Later versions make it easier still. 

I know because I made [a working proof of concept](https://github.com/rpm-software-management/rpm/compare/master...encukou:rpm:python-abi3). 
I will work on the CPython side to enable making this patch more elegant :)

If issues around the limitation (or reference counting, or the Python wrappers in general) come up, please let me know.
If not -- see you in 3+ years, when it's time for `_rpm` to start using Python 3.10+ API! :)

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