refactor(time): consolidate ClockId usage via the public time::Clock trait

Remove direct `rustix::time::ClockId` imports by centralizing its dependency within the `time` module.

src/pinger_icmp.rs

@@ -14,7 +14,6 @@ use crate::time::{ClockSample, Monotonic};
 use icmp_socket2::Icmpv4Message;
 use icmp_socket2::Icmpv4Packet;
 use icmp_socket2::packet::WithEchoRequest;
-use rustix::time::ClockId;
 
 pub struct PingerICMPEchoListener {}