Support building abi3 wheels

[erikjohnston]

When building wheels for a project that has a build script, it would be very useful to be able to tag the wheels as abi3 compatible (assuming the build script outputs abi3 compatible libs).

We (Synapse) use a build script and setuptools_rust to allow us to use Rust code. In CI we use cibuildwheel to build wheels for various platforms and architectures, which can take a significant amount of time. Having to build a wheel for each cpython version unnecessarily is a significant chunk of that time.

I'm not familiar with how this is meant to work across different build systems, but as a first step it would be useful to have some way of forcing poetry to output the wheel with an abi3 tag. I think the relevant line we decide on the tag for the wheel is here.

[neersighted]

Duplicate #2051, unless I am mistaken; you want control over tags that are applied, which that issue should cover.

[erikjohnston]

Ah sorry, I was looking for ABI3 specifically. Thanks, that does look like exactly what we want!

[github-actions]

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