Add support for server-ssl-sni-context

Add the server-ssl-sni-context resource to the elytron subsystem configuration.

The resource is /subsystem=elytron/server-ssl-sni-context=*

It will be placed on the following navigation path Configuration → Subsystem Security (Elytron) → Other Settings → SSL It will feature te regular table with add and remove buttons and the form to edit the values.

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