Add support for use certificate chain for cmd_SignCertificate and cmd… #1393

Job	Run time
basic_gcc	4m 19s
check_update	58s
check-ansi	1m 55s
basic_clang	4m 12s
minimal	2m 6s
no-deprecated	3m 57s
non-caching	4m 17s
no-shared (ubuntu-latest)	3m 11s
buildtest	6m 23s
no-shared (macos-latest)	2m 24s
address_ub_sanitizer	11m 14s
enable_non-default_options	3m 39s
fips_and_ktls	4m 20s
legacy	3m 46s
memory_sanitizer	26m 34s
no-legacy	4m 11s
ntls_address_ub_sanitizer	9m 51s
ntls_memory_sanitizer	17m 56s
symbol_prefix-test	6m 58s
threads_sanitizer	3m 30s
EC_POINTs_api_test	19m 39s
external-test-pyca (1.51.0, 3.9)	1m 25s
ntls-with-fips	7m 52s
ntls-without-sm234	6m 58s
out-of-source-and-install (ubuntu-latest)	4m 21s
phe_test	35m 14s
out-of-source-and-install (macos-latest)	3m 28s
sm2-threshold-test	43m 41s
smtc_and_ntls	2m 10s
zkp-build-test	3m 18s
	4h 13m 47s

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