Encoding for Elytron properties realm

Issue

• Migrating legacy UsersRoles to new Elytron subsystem:

  <login-module code="UsersRoles" flag="required">
        <module-option name="usersProperties" value="${jboss.server.config.dir}/users.properties"></module-option>
        <module-option name="rolesProperties" value="${jboss.server.config.dir}/roles.properties"></module-option>
        <module-option name="unauthenticatedIdentity" value="guest"></module-option>
        <module-option name="hashAlgorithm" value="MD5"/>
        <module-option name="hashEncoding" value="base64"/>
  </login-module>
  

Under Elytron it should be migrated as

     <properties-realm groups-attribute="Roles" name="somerole">
         <users-properties digest-realm-name="Application Security" path="users.properties" plain-text="false" relative-to="jboss.server.config.dir"></users-properties>
         <groups-properties path="roles.properties" relative-to="jboss.server.config.dir"></groups-properties>
    </properties-realm>

But we are unable to add the encoding