Introduce the Prague congestion control #1708
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This adds support for reporting incoming ECN counts via the "ECN Counts" field in ACK frames. Applications can report the ECN marking for incoming packets through the new `ecn` field of `RecvInfo`, and internally quiche will track the ECN counters, and creates ACK frames with the ECN Counts field. TODO: * Fetch ECN markings for incoming packets in apps.
TODO: * Set ECN markings for outgoing packets in apps. * Probe ECN for each path. * Validate ECN counts in ACKs.
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This PR introduces the Prague congestion control (described in the IETF draft draft-briscoe-iccrg-prague-congestion-control). Note that it depends on ECN, and so has a dependency on #1351.