Add --max-workers and heuristics for parallel operations

add a global flag for --max-workers so users can limit the number
of parallel operations for a given function.  also, when not limited
by max-workers, we implement a heuristic function that returns the
number of preferred parallel workers based on the number of CPUs and
the given operation.

Signed-off-by: baude <bbaude@redhat.com>

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