Add subinterpreter support #2381

Job	Run time
Build source distribution	11s
Decide which wheel types to build	3s
manylinux_x86_64 wheels	3m 42s
musllinux_x86_64 wheels	3m 34s
musllinux_x86_64 wheels	3m 43s
manylinux_aarch64 wheels	3m 32s
manylinux_x86_64 wheels	2m 56s
manylinux_aarch64 wheels	3m 40s
test_wheels_in_debian	1s
test_aarch64_wheels	1s
test_free_threading	1s
test_wheels_in_fedora	1s
test_wheels_in_arch	1s
test_attaching_to_eol_interpreters	1s
test_wheels	1s
test_in_alpine	1s
test_attaching_to_uv_interpreters	1s
upload_pypi	1s
	21m 31s

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