envoyproxy/envoy

quic: add a config knob for congestion control algorithm

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#20.109 aperta il 24 feb 2022

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Right now the default is BBR and enabled by hard coding a QUICHE reloadable flag in #19349 quic: enable BBR congestion control. But we want it to be configurable, especially distinguishable between upstream and downstream. As discussed with @ggreenway, the preferred default value should be CUBIC, in consideration of https://en.m.wikipedia.org/wiki/TCP_congestion_control#TCP_BBR.

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