perf: add eth response backpressure #13971
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this introduces a new parameter that effectively restricts how many concurrent requests we support.
if we have more that 4 concurrent outgoing responses, we deprioritize reading more messages from the peer.
this additional check is relatively cheap and would only apply to peers that are spamming us with requests. This targets 10MB of buffered response data.
well behaved peers shouldn't encounter this because usually those send requests sequentially