feature: execute load()/unload() methods found in _pre.ts files

server.ts

@@ -25,6 +25,7 @@ type LOGGER = (request: Request, response: Response, processing_time: number) =>
  */
 interface HANDLER_MODULE {
 	default: HANDLER;
+	load?: () => void | Promise<void>;
 	unload?: () => void | Promise<void>;
 }
 
@@ -146,6 +147,10 @@ export class SERVER {
 					}
 
 					this.handlers.push(handler_module);
+
+					if (handler_module.load) {
+						await handler_module.load();
+					}
 				}
 			} catch (error) {
 				if (error instanceof Deno.errors.NotFound) {