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[util] Benchmark throughput of util queues

Problem / Solution

These benchmarks measure the overhead of various implementations of a
conduit between a `source: () => Future[Buf]` and `sink: Buf =>
Future[Unit]`.

The steps are as follows:

1. connect the source to the conduit
2. drain n items from the conduit into the sink

The conduits under assessment are AsyncQueue, AsyncStream, Broker and
Reader. Additionally, there's a control benchmark with no conduit, i.e., the
source is plugged directly into the sink.

RB_ID=731186

36 of 36 new or added lines in 1 file covered. (100.0%)

4945 of 7589 relevant lines covered (65.16%)

3.85 hits per line