Add X509_NAME_hash_ex() to be able to check if it failed due to unsupported SHA1

Add X509_NAME_hash_ex() to be able to check if it failed due to unsupported SHA1

Deprecate X509_NAME_hash()
Document X509_NAME_hash_ex(), X509_NAME_hash(), X509_{subject,issuer}_name_hash()

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13762)