Implement ABI3 wheels

[ocefpaf]

Following spec 0 here and dropping Python 3.10 before its EoL. That not only simplifies our test and build matrix significantly, but helps us use ABI3 and build a single wheel for each arch.

[ocefpaf]

@efiring are you OK dropping Python 3.10 here? We do have wheels built for it already and it is unlikely that we will release a new version anytime soon, IMO it should be OK.

[DocOtak]

Should SPEC0 be explicitly followed? Though would suggest dropping python 3.11 too...

[ocefpaf]

Should SPEC0 be explicitly followed? Though would suggest dropping python 3.11 too...

With ABI3, not really, we my goal is to reduce the maintenance burden by reducing the wheel build matrix. Python 3.11 is the first version that I can do that, so why not? I'm mostly using it as an excuse to remove 3.10, which would require us to have to build systems: one for 3.10 and another one for ABI3.

[DocOtak]

I think I mistyped... meant that SPEC0 has dropped 3.11, so was arguing with myself against straight adoption of it.

[efiring]

Looks good to me. I don't see any problem with setting 3.11 as the minimum for now.