Add metrics of yamux ping timeout and latency

[jjyr]

This PR introduce a feature metrics.

Currently we record the following metrics:

• yamux.ping_timeout
• yamux.ping_latency

---

By adding ping metrics, we want to identify the following TimedOut error of fiber.

  2025-10-13T09:51:53.826342Z DEBUG tentacle::session: session poll error: Kind(TimedOut)
    at /root/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tentacle-0.7.2/src/session.rs:970

  2025-10-13T09:51:53.826957Z DEBUG tentacle::session: MuxerError: Kind(TimedOut)
    at /root/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tentacle-0.7.2/src/session.rs:983