Add subinterpreter support #2380

Job	Run time
Decide which wheel types to build	3s
Build source distribution	7s
manylinux_x86_64 wheels	2m 48s
manylinux_x86_64 wheels	6m 21s
musllinux_x86_64 wheels	7m 37s
manylinux_aarch64 wheels	5m 56s
manylinux_aarch64 wheels	3m 47s
musllinux_x86_64 wheels	3m 53s
test_in_alpine	41s
test_wheels_in_arch	50s
test_attaching_to_eol_interpreters (2.7)	1m 9s
test_free_threading (3.15)	2m 21s
test_attaching_to_eol_interpreters (3.7)	1m 24s
test_attaching_to_uv_interpreters (3.13)	37s
test_free_threading (3.13)	1m 37s
test_aarch64_wheels (3.9)	1m 15s
test_wheels_in_fedora	1m 21s
test_free_threading (3.14)	2m 1s
test_aarch64_wheels (3.13)	1m 13s
test_aarch64_wheels (3.14)	1m 14s
test_aarch64_wheels (3.15)	1m 19s
test_wheels_in_debian	1m 1s
test_wheels (3.11)	1m 17s
test_wheels (3.12)	1m 13s
test_wheels (3.14t)	2m 30s
test_wheels (3.15)	58s
test_wheels (3.10)	58s
test_wheels (3.13t)	2m 30s
test_wheels (3.9)	1m 6s
test_wheels (3.13)	1m 8s
test_wheels (3.14)	1m 14s
test_wheels (3.15t)	1m 57s
upload_pypi	0s
	1h 3m 26s

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