Support watchosArm32 (Apple Watch Series 3 and before)

[glureau]

Use case

Be able to support those models could be great, also I presume it doesn't involve too much trickery/support for that.

Describe the solution you'd like

I can write the PR if there is no constraint on your side to provide support for this platform (looks simple enough) and if you're ok for the added build time on CI. Also I'm not sure if the current CI can support building on arm32 🤔

[BoD]

Hi! 👋

I think this could be added without any issue - pretty sure the MacOS images we use for the CI should work (at least it looks like Okio use the same machines and they do target watchosArm32).

A PR would be welcome!