feat: fix slowcmd log duration error with batch command && add proxy metrics

[wangshao1]

1. 调整proxy slowlog打印级别为warn，slowlog不再打印堆栈信息。
2. 调整proxy日志打印时间为微妙。
3. 修复mget等批量接口打印慢请求日志时统计不到各个阶段耗时的情况。
4. codis proxy增加tp999，tp9999耗时统计，通过/proxy/stats暴露给exporter。
5. 修改pika_exporter代码，将proxy的tp耗时导出为prometheus指标。

[coderabbitai]

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