Creating a grouped dataframe out of multiple csv files

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Note that CSV.read does this automatically already if you pass a vector of file names to parse:

help?> CSV.read
  CSV.read(source, sink::T; kwargs...) => T

  Read and parses a delimited file or files, materializing directly using the sink function. Allows avoiding excessive copies of columns for certain sinks like DataFrame.

(...)

 source: [only applicable for vector of inputs to CSV.File] a Symbol, String, or Pair of Symbol or String to Vector. As a single Symbol or String, provides the column name that will be added to the parsed columns, the values
       of the column will be the input "name" (usually file name) of the input from whence the value was parsed. As a Pair, the 2nd part of the pair should be a Vector of values matching the length of the # of inputs, where each
       value will be used instead of the input name for that inputs values in the auto-added column.
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