API: add function to get all extensions present, not just recognized … #1

Job	Run time
address_ub_sanitizer	9m 48s
basic_clang	1m 17s
basic_gcc	1m 6s
check_docs	56s
check_update	1m 15s
check-ansi	57s
enable_non-default_options	58s
fips_and_ktls	1m 7s
fuzz_tests	2m 51s
legacy	47s
memory_sanitizer	18m 26s
minimal	43s
no-deprecated	1m 1s
no-legacy	1m 1s
non-caching	12m 57s
no-shared-macos (macos-13)	1m 35s
no-shared-macos (macos-14)	44s
no-shared-ubuntu	1m 2s
self-hosted	0s
out-of-readonly-source-and-install-ubuntu	1m 2s
threads_sanitizer	1m 18s
external-test-cf-quiche	1m 28s
external-test-pyca (1.51.0, 3.9)	1m 11s
external-tests	1m 30s
out-of-readonly-source-and-install-macos (macos-13)	1m 32s
out-of-readonly-source-and-install-macos (macos-14)	46s
	1h 7m 18s

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