This commit is a bit of a hack. The first thing I could think of. The
problem is that I want to be able to benchmark various modules in the
read buffer but I don't want to expose those internals via the external
API.
Becuase criterion only lets you exercise the exported API I needed to
expose some internals. I did this by creating a documented module
`benchmarks` in the `read_buffer` crate, which re-exports identifiers
that can be used by a criterion crate.
The idea is that it will be clear that this module is not part of the
public API.
Edd Robinson