Support mapping of end entity SAN from the CSR

[3keyroman]

Currently the connector supports SAN data from the Data Attribute that is possible to use when the certificate is managed through the API of the Core. However, when the CSR is coming from the protocols, Core is not able to perform mapping of the SAN data to certificate and eventually end entity.

In general, it would be useful to support adding SAN data from the CSR that is provided.
The mechanism can be implemented in a way that CSR SAN data has higher priority than Data Attribute, or it can be merged.