Re-creates the GCAM data map by pulling the data out of cache and processing its metadata. We need to know the plan to be able to identify which data to to pull and the chunk names that generated them.
create_datamap_from_cache(gcamdata_plan, ...)
The drake plan that generated the outputs
Parameters to pass directly to drake::readd to allow users to specify a non-default cache for instance.
The full GCAM data map