io: add BufStream::with_capacity
#2125
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Motivation
Currently it's not possible to configure the buffer size when creating a
BufStream.I'm using
BufStreamto wrap aTcpStreamand having totokio::io::splitit and pass each half toBufReader::with_capacityandBufWriter::with_capacityseems sub-optimal.Solution
This PR adds a
BufStream::with_capacitymethod that takes as input both the capacity of the read buffer and the capacity of the write buffer.Not sure if this is the best API, but it seemed more flexible than having a single capacity as input.