perf: Simplify process data handling and improve performance

[HynoR]

What this PR does / why we need it?

查找进程为了不必要的逻辑分配了更多的性能开销，本身每次proc.process 就会遍历一次链接，为了消化这么多遍历又用多线程来解决， 再加上锁和排序的开销，导致整体函数比较臃肿。

Summary of your change

• 修改方案，从原本的gopsutil每个进程遍历+过滤链接，变成只gopsutil拿一次全部链接，然后自行用map 和进程 pid 对号入座。
• 预分配切片大小减少扩容分配。
• 移除多线程相关逻辑，直接单线程执行优化后的方案

单线程的新方案执行速度是原本多线程遍历的一倍，并且内存开支更低，gc 更稳定。

测试返回内容没有变化

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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[zhengkunwang223]

/LGTM