Add script(s) to generate bundles data

[milanmlft]

• Have script for finding the top 80% most frequent individual labs from EPIC that are in EXM
• Find the lab procedure/battery that for each of these labs that we have in EXM. e.g. map from red blood cell count, neutrophil count etc. to the grouping full blood count
• write out to two types of csv files (see project description)
  • many {bundle_id}.csv files (can use the procedure code from EPIC as the bundle_id), would be nice to have the OMOP concept human readable name in there as well
  • a single bundle_names.csv mapping (can use the human readable name for the lab procedure from EPIC as the bundle name). e.g. FBC -> Full blood count
• copy these csv files to omop-bundles repo with these files. inst/data-raw/measurement

We know when we're done when we have the csv files in the omop-bundles, via pull request