Adding support for CADES → CMS_CADES flag

[mibofra]

I am creating this issue as https://docs.rs/openssl/0.10.68/openssl/cms/struct.CMSOptions.html does not have const CADES among the others, corresponding to CMS_CADES from the OpenSSL (since version 3.0.0) API, permitting to create CAdES-BES compliant CMS structures.

I have already created a pull request for this, implementing all the necessary things → #2349

This is to track the issue itself down, as for reasons, the realted pull request can be also not accepted.

Feel free to close this/I am going to close this issue instead, if the related pull request is accepted and merged.