pivot a column grouping to a row grouping, pass the specification of the
new row grouping using the <code>cols</code> argument. The format is <code><a href='https://rdrr.io/r/base/list.html'>list(values_col =
"oldcol_1", "oldcol_2", ...)</a></code>. This will take all the data from the old columns,
combine them into a new column <code>values_col</code>, and automatically provide
a grouping variable, which will be called <code>name</code>. The values of <code>name</code>
will be the corresponding names of th