feat(plugins): add basic message construction (#5754)

src/controllers/plugins/LuaAPI.hpp

@@ -85,6 +85,7 @@ sol::table toTable(lua_State *L, const CompletionEvent &ev);
  * @includefile controllers/plugins/api/ChannelRef.hpp
  * @includefile controllers/plugins/api/HTTPResponse.hpp
  * @includefile controllers/plugins/api/HTTPRequest.hpp
+ * @includefile controllers/plugins/api/Message.hpp
  * @includefile controllers/plugins/api/WebSocket.hpp
  * @includefile common/network/NetworkCommon.hpp
  */