feat(bbr3) Implemented bbr3's latest version based on the RFC#2481

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Tipuch wants to merge 7 commits intoquinn-rs:mainfrom

Commits on Jan 24, 2026

added more granular packet events for congestion controllers, necessary for some delay based algorithms such as BBRv3
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added send_quantum to controller metrics, changed pacing_rate from bits/s to bytes/s
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modified Pacer such that congestion controller metrics can be used to adjust the burst size and the overall pacing rate of the connection
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added BBRv3 algorithm, including MaxFilter from Kathleen Nichols
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removed previous BBR implementation
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removed duplicate event on congestion controller, removed constants from BBR3 struct, fixed data type for cycle_count
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added more documentation to max_filter.rs and to bbr3 configuration
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