Add subinterpreter support #2377

Job	Run time
Decide which wheel types to build	3s
Build source distribution	10s
musllinux_x86_64 wheels	8m 2s
manylinux_x86_64 wheels	6m 19s
manylinux_x86_64 wheels	2m 46s
manylinux_aarch64 wheels	3m 52s
manylinux_aarch64 wheels	5m 57s
musllinux_x86_64 wheels	3m 26s
test_attaching_to_eol_interpreters (3.7)	1m 12s
test_attaching_to_eol_interpreters (2.7)	1m 32s
test_free_threading (3.14)	1m 58s
test_wheels_in_arch	46s
test_in_alpine	45s
test_free_threading (3.15)	1m 44s
test_attaching_to_uv_interpreters (3.13)	35s
test_aarch64_wheels (3.9)	1m 15s
test_free_threading (3.13)	1m 59s
test_aarch64_wheels (3.13)	1m 21s
test_aarch64_wheels (3.14)	1m 14s
test_wheels_in_fedora	1m 5s
test_aarch64_wheels (3.15)	1m 14s
test_wheels_in_debian	55s
test_wheels (3.9)	1m 13s
test_wheels (3.13)	1m 0s
test_wheels (3.10)	59s
test_wheels (3.14)	1m 8s
test_wheels (3.13t)	2m 24s
test_wheels (3.15)	1m 12s
test_wheels (3.12)	1m 10s
test_wheels (3.15t)	1m 58s
test_wheels (3.11)	56s
test_wheels (3.14t)	2m 9s
upload_pypi	-1s
	1h 2m 18s

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