refactor: move unimplemented command detection into config file

subcommands/export

@@ -13,6 +13,7 @@ service-export-cmd() {
   declare desc="export a dump of the $PLUGIN_SERVICE service database"
   local cmd="$PLUGIN_COMMAND_PREFIX:export" argv=("$@"); [[ ${argv[0]} == "$cmd" ]] && shift 1
   declare SERVICE="$1"
+  is_implemented_command "$cmd" || dokku_log_fail "Not yet implemented"
 
   [[ -z "$SERVICE" ]] && dokku_log_fail "Please specify a name for the service"
   verify_service_name "$SERVICE"