Add subinterpreter support #2376

Job	Run time
Decide which wheel types to build	4s
Build source distribution	12s
musllinux_x86_64 wheels	3m 34s
manylinux_x86_64 wheels	6m 27s
musllinux_x86_64 wheels	8m 0s
manylinux_aarch64 wheels	6m 27s
manylinux_aarch64 wheels	3m 45s
manylinux_x86_64 wheels	3m 0s
test_wheels_in_debian	57s
test_attaching_to_uv_interpreters (3.13)	38s
test_wheels_in_arch	48s
test_free_threading (3.15)	2m 5s
test_wheels_in_fedora	55s
test_in_alpine	40s
test_free_threading (3.13)	1m 53s
test_free_threading (3.14)	1m 45s
test_aarch64_wheels (3.13)	1m 9s
test_attaching_to_eol_interpreters (2.7)	1m 0s
test_aarch64_wheels (3.15)	1m 17s
test_aarch64_wheels (3.14)	1m 18s
test_aarch64_wheels (3.9)	1m 8s
test_attaching_to_eol_interpreters (3.7)	8m 11s
test_wheels (3.9)	1m 0s
test_wheels (3.13t)	2m 31s
test_wheels (3.15)	1m 11s
test_wheels (3.11)	1m 5s
test_wheels (3.15t)	2m 5s
test_wheels (3.12)	59s
test_wheels (3.14t)	2m 26s
test_wheels (3.10)	52s
test_wheels (3.13)	1m 45s
test_wheels (3.14)	1m 29s
upload_pypi	0s
	1h 10m 36s

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