hugetop: print human readable sizes by default

`w`: Shows incorrect value in the `WHAT` column

The `pgrep -x` command will report an error message when performing a length check.

Remove `libc` in `top`

Remove `libc` in `ps`

Remove `libc` in `pkill`

Remove direct dependence `libc`

Use `rustix` to replace all `libc` usage

w: invalid truncating with long usernames

[feature request] `waitpid` via `epoll()`