Use PipeReader for more efficient line reading in BufferedReadStream #57
Description
BufferedReadStream.ReadLineAsync currently reads byte-by-byte which isn't ideal for performance.
On .NET 6+, we could use System.IO.Pipelines with PipeReader for more efficient buffered line reading. Would need to be careful with chunked transfer encoding though - the PipeReader would need to play nice with how ChunkedReadStream consumes data.
Might need some investigation to get right, but could be a nice perf win for response parsing.