cms: Create test for for purpose verification in cms application

cms: Create test for for purpose verification in cms application

The tests only cover the correct handling of the codesigning purpose in the certificates
in the context of the cms command line tool.
The interpretation of the certificate purpose is tested in the context of the "verify"
app. The correct handling of the cms objects is tested by other tests in 80-test_cms.t.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18567)