Add pyi to linuxarm64 wheels

[TheTripleV]

Unlike the rio wheels, editing code directly on a Raspberry Pi with intellisense is possible (Vscode Remote).

It would be good to run stubgen on wheels targeting the Pi.

[virtuald]

To do this, someone would need to add qemu-arm-static to the various docker images and check that it can run the python interpreter that we cross-compile. Should be straightforward?