🦄 refactor(plugin manager): update interface definition

src/plugin_manager/plugin_manager.cpp

@@ -28,17 +28,27 @@ struct plugin_manager
 	struct session_event_callback_map *session_ev_cb_map;
 };
 
-struct plugin_manager g_plug_mgr;
 #endif
 
-int plugin_session_event_register(const char *session_name, 
+struct plugin_manager_handle *plugin_manager_init()
+{
+	return nullptr;
+}
+
+int plugin_manager_load(const char *plugin_conf_path)
+{
+	return 0;
+}
+
+int plugin_manager_event_register(struct plugin_manager_handle *h,
+				  const char *session_type_name, 
                                   fn_session_event_callback call_back, 
                                   const struct timeval *timeout)
 {
 	return 0;
 }
 
-void plugin_manager_dispatch(struct stellar_event *event)
+void plugin_manager_dispatch(struct plugin_manager_handle *h, struct stellar_event *event)
 {
 #if 0
 	struct session *s = container_of(event, struct session, cur_ev);