Add the observation function for slow, timeout and error system calls

[yaofighting]

Background
With the increase of the number of applications and services in the system, we often need to locate some system calls that run for a long time or have errors. They are often bottlenecks that cause service or application problems.

Solution
System call information is obtained in the kernel based on eBPF technology. System calls are analyzed, processed and correlated in user space. Long running system calls are divided into slow system calls and timeout system calls. Slow system calls will be matched immediately according to enter and exit, and overtime system calls will be judged by the timed polling mechanism.The timeout time of the timeout system call and the slow threshold determination time of the slow system call are both configured by the user.

Features
[1] Modify the configuration file structure and add parameter fields for subscription events.
[2] Achieve the Slow Syscall function.
[3] Achieve the Timeout Syscall function.

[dxsup]

There is still a lot of work to do. Expect this can be finished before February.

[dxsup]

We won't be scheduling this feature in the near future since we haven't identified a valuable use case for it yet. We need more information before we can decide whether to continue working on it.