Limit concurrency of piece retrieval from node via RPC #2034
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As described in paritytech/jsonrpsee#1189 node right now is having a hard time serving piece retrieval requests. In local setup by sending too many most will time out in 60 secodns, triggering piece reconstruction, making things even worse in terms of time it takes to plot a sector.
Limiting it to low number fixes the issue and should only really affect local setup since in acctual network L2 DSN cache should be able to serve most (ideally all) requests.
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