@Bean
    @ConditionalOnBean(ShenyuThreadPoolExecutor.class)
    public ShenyuThreadPoolExecutorDestructor shenyuThreadPoolExecutorDestructor() {
        return new ShenyuThreadPoolExecutorDestructor();
    }
destroy the shenyu shared thread pool executor.

@return the shenyu thread pool executor destructor
shenyu-web/src/main/java/org/apache/shenyu/web/configuration/ShenyuThreadPoolConfiguration.java