(captiveportal, new) add initial configd template

src/opnsense/service/conf/actions.d/actions_captiveportal.conf

+[list_clients]
+command:/usr/local/opnsense/scripts/OPNsense/CaptivePortal/listClients.py
+parameters:/zoneid %s /output_type %s
+type:script_output
+message:list registered clients
+
+[allow]
+command:/usr/local/opnsense/scripts/OPNsense/CaptivePortal/allow.py
+parameters:/zoneid %s /username %s /ip_address %s /output_type %s
+type:script_output
+message:allow client access to captive portal
+
+[disconnect]
+command:/usr/local/opnsense/scripts/OPNsense/CaptivePortal/disconnect.py
+parameters:/zoneid %s /sessionid %s /output_type %s
+type:script_output
+message:disconnect client