Get Metadata Summary

{
    "request_type":"get_metadata_summary",
}

{
    "summary_list" : [
                        {
                          "form_type" : "<form type>",
                          "form_data" : "<form name>",
                          "entity?"   : <boolean>,
                          "number_instances" : <number>
                         }
                      ...
                   ]

}