fix[hmi-server]: Dataset extract columns, doing it on GET if not present #2862
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Description
This is actually the fix for incorrect column information after a beaker-driven transform too. There is a corresponding change on beaker that blows away column data (DARPA-ASKEM/askem-beaker#95) since columns and/or data will have changed in modified datasets. Then on a GET call we repopulate the column data because its empty. This will also cover any situation where a CSV/dataset was some how uploaded and the column data was empty too. In addition, this centralizes some code around getting CSV files and updating headers.
Resolves #2784