feature: print the CPU usage during sampling cpu profile

[doujiang24]

The cpu profile may missing the CPU usage high time, when CPU usage goes down quickly.
eg. #123 (comment)

we may record the CPU usage during sampling the CPU profile, and log it.
eg. we can start another goroutine, and log CPU usage continuously.

[songzhibin97]

During the configuration file change? Is it feasible to pull up the new one before turning off the old one?

[doujiang24]

During the configuration file change? Is it feasible to pull up the new one before turning off the old one?

跟配置变化没关系呢
这里说的是，检查的时候，CPU 是异常，但是采样的时候，CPU 又恢复了的情况，这期间有那么几秒钟间隔

[dumbFeng]

监控到异常时，已经通过scene传递了cpu使用率。

[doujiang24]

@dumbFeng 我说的是，采样期间的 cpu 使用率呢，这中间有一个时间差的。
目前 scene 透出的是触发采样的数据，并不是采样期间的（采样会有好几秒）