Add subinterpreter support #2386

Job	Run time
Decide which wheel types to build	4s
Build source distribution	13s
manylinux_aarch64 wheels	6m 5s
manylinux_x86_64 wheels	6m 11s
musllinux_x86_64 wheels	3m 37s
musllinux_x86_64 wheels	7m 55s
manylinux_x86_64 wheels	2m 50s
manylinux_aarch64 wheels	3m 47s
test_attaching_to_eol_interpreters (3.7)	1m 22s
test_attaching_to_uv_interpreters (3.13)	42s
test_free_threading (3.14)	1m 57s
test_free_threading (3.13)	1m 55s
test_attaching_to_eol_interpreters (2.7)	1m 12s
test_wheels_in_arch	45s
test_aarch64_wheels (3.9)	1m 12s
test_free_threading (3.15)	2m 21s
test_aarch64_wheels (3.13)	1m 18s
test_aarch64_wheels (3.14)	1m 38s
test_wheels_in_debian	1m 1s
test_aarch64_wheels (3.15)	1m 19s
test_wheels_in_fedora	1m 3s
test_in_alpine	44s
test_wheels (3.13t)	2m 27s
test_wheels (3.11)	1m 15s
test_wheels (3.12)	1m 0s
test_wheels (3.9)	1m 15s
test_wheels (3.13)	58s
test_wheels (3.15)	1m 1s
test_wheels (3.10)	1m 3s
test_wheels (3.14)	1m 7s
test_wheels (3.15t)	2m 10s
test_wheels (3.14t)	2m 18s
upload_pypi	0s
	1h 3m 45s

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