perf(http2): reduce adaptive window pings as the BDP stabilizes #2550
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This introduces a delay to sending a ping to calculate the BDP that
becomes shorter as the BDP is changing, to improve throughput quickly,
but then also becomes longer as the BDP stabilizes, to reduce the amount
of pings sent. This improved the performance of the adaptive window
end_to_end benchmark.
It should also reduce the amount of pings the remote has to deal with,
hopefully preventing hyper from triggering ENHANCE_YOUR_CALM errors.
cc #2526