Split fio read/write and randread/randwrite operations
Split fio read/write and randread/randwrite operations

The fio benchmark was changed to a fixed size read/write ammount
because the timed benchmark was overwhelming machine memory on
tmpfs mounts.

Now rand(read|write) operations are prohibitively long, leading to timeouts.

Split the benchmarks as they were in python bm-tools: the read/write as
fixed sized (1GB) and the rand(read|write) as timed operations (15s).

PiperOrigin-RevId: 364584436

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