Split WildFly Elytron into two modules with a public / private split.

The Elytron jar will be contained within a private module, possibly 'elytron-private' then a module 'elytron' will depend on this and make the public packages visible.

The following packages have been identified as being private: -

org.wildfly.security._private
org.wildfly.security.asn1
org.wildfly.security.auth.realm
org.wildfly.security.auth.realm.*
org.wildfly.security.authz.jacc
org.wildfly.security.credential.store.impl
org.wildfly.security.security.digest
org.wildfly.security.http.impl
org.wildfly.security.security.keystore
org.wildfly.security.mechanism.oauth2
org.wildfly.security.mechanism.scram
org.wildfly.security.password.impl
org.wildfly.security.password.util
org.wildfly.security.pem
org.wildfly.security.sasl
org.wildfly.security.sasl.* (Except util)
org.wildfly.security.util
org.wildfly.security.util_private
org.wildfly.security.x500
org.wildfly.security.x500.cert