Add a CMS API test

Previous tests only invoked CMS via the command line app. This test uses
the CMS API directly to do and encrypt and decrypt operation. This test
would have caught the memory leak fixed by the previous commit (when
building with enable-crypto-mdebug).

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6142)