Ability to directly provide client SSL keyfile with custom SSL Context

Currently when user wants to use cluent SSL authentication the only option to specify path to SSL keyfile is via javax.net.ssl.* JVM_OPTS properties. This seems to be the usual way with mongodb driver. However (according to the team) it is not a good idea to mess with global SSL configuration when using Strimzi.

In order to make the configuration more user firendly and to workaround this "limitation" we should introduce options to setup ssl keyfile and pass a custom SSL context to client builder [1]

[1] https://www.mongodb.com/docs/drivers/java/sync/current/fundamentals/connection/tls/#std-label-tls-custom-sslContext