Create a buffered wrapper around BytesStream #5600

Job	Run time
Measure coverage	27m 47s
miri	3m 1s
Basic Checks	22m 11s
Additional Builds and Concurrency Tests	14m 21s
Release builds and tests	8m 41s
sanitize (address)	18m 11s
Slow tests	17m 16s
sanitize (address, multi-threading)	19m 31s
sanitize (leak)	7m 50s
sanitize (leak, multi-threading)	10m 7s
	2h 28m 56s

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