Add subinterpreter support #2103

Job	Run time
Build source distribution	12s
Decide which wheel types to build	2s
musllinux_x86_64 wheels	12m 12s
manylinux_x86_64 wheels	8m 40s
manylinux_aarch64 wheels	10m 26s
test_free_threading (3.13)	1m 44s
test_wheels_in_debian	1m 7s
test_attaching_to_uv_interpreters (3.13)	53s
test_free_threading (3.14)	1m 58s
test_aarch64_wheels (3.8)	1m 18s
test_aarch64_wheels (3.14)	1m 38s
test_attaching_to_eol_interpreters (2.7)	1m 10s
test_wheels_in_arch	1m 2s
test_in_alpine	46s
test_aarch64_wheels (3.13)	1m 34s
test_wheels_in_fedora	1m 9s
test_attaching_to_eol_interpreters (3.7)	1m 23s
test_wheels (3.8)	53s
test_wheels (3.10)	52s
test_wheels (3.14)	1m 16s
test_wheels (3.14t)	2m 25s
test_wheels (3.12)	52s
test_wheels (3.13t)	2m 19s
test_wheels (3.11)	48s
test_wheels (3.9)	51s
test_wheels (3.13)	1m 14s
upload_pypi	0s
	58m 44s

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