Add SSL_CTX_dup API #75

Job	Run time
address_ub_sanitizer	9m 54s
basic_clang	1m 18s
basic_gcc	1m 2s
check_docs	53s
check_update	1m 16s
check-ansi	53s
enable_non-default_options	1m 1s
fips_and_ktls	1m 9s
fuzz_tests	3m 3s
memory_sanitizer	19m 51s
minimal	44s
no-deprecated	58s
non-caching	13m 27s
no-shared (ubuntu-latest)	1s
threads_sanitizer	1m 15s
no-shared (macos-latest)	2m 47s
external-test-cf-quiche	1m 25s
external-test-pyca (1.51.0, 3.9)	1m 17s
external-tests	1m 31s
legacy	3m 45s
no-legacy	1m 0s
out-of-source-and-install (ubuntu-latest)	1s
out-of-source-and-install (macos-latest)	1m 59s
	1h 10m 30s

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