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- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

## Describe the proposal
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EN:
Observability task, optimizing thread pool index embedding function
1 Need to specify a name for the core thread pool
2 Core thread pool index is not effective
3. Remove the frame-level indicators and only keep the core monitoring indicators (the frame-level code type is completely deleted and will be considered later)

可观测性任务，优化线程池指标埋点功能
1需要为核心线程池指定名称
2核心线程池指标生效问题
3移除框架层指标只保留核心监控指标
threadPoolExecutor.setMaximumPoolSize(threads);
                        if (core == max) {
                            threadPoolExecutor.setCorePoolSize(threads);
                        }
                    }
                }
            }
        } catch (Throwable t) {
            logger.error(COMMON_ERROR_USE_THREAD_POOL, "", "", t.getMessage(), t);
        }
    }
    @Override
    public ScheduledExecutorService getServiceExportExecutor() {
        synchronized (LOCK) {
            if (serviceExportExecutor == null) {
                int coreSize = getExportThreadNum();
                String applicationName = applicationModel.tryGetApplicationName();
                applicationName = StringUtils.isEmpty(applicationName) ? "app" : applicationName;
                serviceExportExecutor = Executors.newScheduledThreadPool(coreSize,
                    new NamedThreadFactory("Dubbo-" + applicationName + "-service-export", true));
            }
        }
        return serviceExportExecutor;
    }
    @Override
    public void shutdownServiceExportExecutor() {
        synchronized (LOCK) {
            if (serviceExportExecutor != null && !serviceExportExecutor.isShutdown()) {
                try {
                    serviceExportExecutor.shutdown();