Add support for building iOS wheels. #4827

Job	Run time
Linters (mypy, flake8, etc.)	44s
Test on ubuntu-latest (3.13)	36m 57s
Get qemu emulated architectures	7s
Test on ubuntu-24.04-arm (3.13)	22m 59s
Test cibuildwheel building Pyodide wheels	5m 19s
Test on windows-latest (3.13)	43m 24s
Test on macos-13 (3.13)	26m 48s
Test on macos-14 (3.13)	30m 14s
Test on ubuntu-latest (3.11)	38m 29s
Test Linux aarch64 using qemu	23m 14s
Test Linux armv7l using qemu	15m 12s
Test Linux ppc64le using qemu	15m 29s
Test Linux s390x using qemu	17m 26s
	4h 36m 22s

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