Function middleware

packages/hono/test/shared/applyPatches.test.ts:405–407

(_c: unknown, next: () => Promise<void>)

      const OPENAPI = Symbol('openapi');
      const META = Symbol('meta');
      const middleware = async function authMiddleware(_c: unknown, next: () => Promise<void>) {
        await next();
      };
      (middleware as any)[OPENAPI] = { security: [{ bearer: [] }] };
      (middleware as any)[META] = { rateLimit: 100 };
      (middleware as any).customProp = 'preserved';