Add support for KEM operation on EC keys

[Jakuje]

Describe the feature
The OpenSSL supports KEM operations on ECC keys. This does not exist on the PKCS#11 layer, but it might be possible to compose the operation somehow. Related to #667 which is RFE for the composed hybrid KEM methods.

Expected behavior
The pkeyutl provides simpley way to test the operation, which fails now.

But interestingly enough, the encapsulation works, but the decapsulation does not (unless I messed something up)

Test Encapsulation with public X25519 key imported from file                     
 openssl pkeyutl -encap -pubin                                                   
                  -inkey ${TMPPDIR}/file.x25519.pub.key.pem                      
                  -secret ${TMPPDIR}/file.x25519.secret                          
                  -out ${TMPPDIR}/file.x25519.public                             
                                                                                 
Test Decapsulation with private X25519 key imported from file                    
 openssl pkeyutl -decap                                                          
                  -inkey ${TMPPDIR}/file.x25519.key.pem                          
                  -in ${TMPPDIR}/file.x25519.public                              
                  -secret ${TMPPDIR}/file.x25519.secret2                         
pkeyutl: Error initializing context                                              
C0D206C3297F0000:error:0308010C:digital envelope routines:inner_evp_generic_fetch:unsupported:crypto/evp/evp_fetch.c:375:Global default library context, Algorithm (X25519 : 108), Properties (<null>)
C0D206C3297F0000:error:03000096:digital envelope routines:evp_kem_init:operation not supported for this keytype:crypto/evp/kem.c:114:

(this was tested with the default_properties = ?provider=pkcs11 in openssl.cnf

[simo5]

This is probably true for RSA as well

[simo5]

@Jakuje I assume that OpenSSL implement DHKEM as described in RFC 9180 ?