Create an interface for retrieving the current step number. #778
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Create an interface for retrieving the current step number.
An implementation of this interface, when called for a
training workload, will return the current step number,
or 0 if training has not started.
This interface will be used for detecting workloads that
hang, i.e., are not making progress. The hang detector
will be implemented later.
Testing: test workloads.