Gal/tcp queue state integration#2
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Export per-socket TCP queue state (unacked, unread, ackdelay) to userspace via getsockopt(TCP_QUEUE_STATE). Each queue exposes time_ns, size, total, and integral fields for computing average queue latency using Little's law (Algorithm 2 from the HotOS 2025 batching paper). Calls tcp_track_sync_all() before sampling to flush integral accumulators. Returns a 96-byte tcp_queue_state_snapshot struct. Signed-off-by: Tom Sela <tomsela366@gmail.com>
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Joined branch of Tom's api and Gal's queue state tracking.