feat: Add online profiling functionality

Tair 有着在线性能统计工具, 有助于性能瓶颈的分析, 故 kiwi 应该实现一个多线程性能统计工具来分析性能瓶颈, 针对性的进行优化.
期望:
1)、可以对关键指标进行统计, 并输出可读信息.(比如磁盘 I/O 相关信息统计)
2)、可配置统计等级, 在统计和性能之间平衡.
3)、对慢请求进行 profiling 的日志输出, 方便问题定位
借用 Tair 的 example :

The issue names no files, tests, or entry points. Start by mapping the request-handling and performance-related parts of the C++ repository, then clarify how metric levels, disk I/O reporting, and slow-request thresholds should be configured and logged; done requires an agreed profiling design and validation criteria.

Written by the indexing model from the issue text.