Add support for building bin bindings wheels with multiple platform tags

[messense]

This allows maturin build --manylinux manylinux_x_y musllinux_x_y -b bin while disallows any other forms of multiple platform tags. (Which is the old behavior before this change).

Closes #927

[netlify]

‼️ Deploy request for maturin-guide rejected.

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[messense]

We can lift this limitation if we want to in the future.

[konstin]

i wonder if it makes sense to have a staticlinux or similar tag which automatically gets tagged with both just like universal2. that way we could keep the single argument logic internally

[messense]

i wonder if it makes sense to have a staticlinux or similar tag which automatically gets tagged with both just like universal2

I think people are more familiar with the standard manylinux/musllinux tags, a staticlinux tag diverges from the standard.

that way we could keep the single argument logic internally

I was thinking about lift the limitation of single platform tags in the future. It's fine to tag a wheel with multiple manylinux/musllinux tags as long as they're audited.