time: add alternative timer for better multicore scalability (#7467)

This change introduces per-worker timer wheels in the time subsystem
to reduce the lock contention.

Key changes:
- Each worker now maintains a local timer wheel.
- Timer insertions are performed locally.
- Timer cancellations are forwarded via a
  dedicated cross-worker cancellation queue.

Relevant RFC: https://github.com/tokio-rs/tokio/issues/7384

---------

Signed-off-by: ADD-SP <[email protected]>

spellcheck.dic

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