Build wheels for Android and iOS

[IsakTheHacker]

Refer to this page for more information and mobile compatibility status of the most popular Python wheels: https://beeware.org/mobile-wheels/

[Vizonex]

@IsakTheHacker I'm no workflow expert but I can put it in our todos which is currently piling up.

• Pickling [TODO] Replace tests/gen_pickles.py with a pytest plugin #922
• C-API Add More Multidict Functions C-API  #1190
• Andriod wheels.