add mult values_from pivot support.

[drizk1]

I noticed in here that pivot_wider cant pivot multiple columns, which I guess is an unstack in dataframes.jl isssue.

Threw together a possible helper function to enable this feature in @pivot_wider

julia> using TidierData, TidierFiles
julia> rent = read_csv("https://raw.githubusercontent.com/tidyverse/tidyr/refs/heads/main/data-raw/us_rent_income.csv")
julia> @chain rent begin 
           @pivot_wider(names_from = variable, 
           values_from = [:estimate, :moe])
           end
52×6 DataFrame
 Row │ GEOID  NAME                  income_estimate  rent_estimate  income_moe  rent_moe 
     │ Int64  String31              String7?         String7?       String3?    String3? 
─────┼───────────────────────────────────────────────────────────────────────────────────
   1 │     1  Alabama               24476            747            136         3
   2 │     2  Alaska                32940            1200           508         13
   3 │     4  Arizona               27517            972            148         4
   4 │     5  Arkansas              23789            709            165         5
   5 │     6  California            29454            1358           109         3
   6 │     8  Colorado              32401            1125           109         5
   7 │     9  Connecticut           35326            1123           195         5

[drizk1]

got tidy selection to work with values_from, so this should be good to go now

julia> @chain rent begin 
           @pivot_wider(names_from = variable, 
           values_from = !(GEOID:variable))
           end
52×6 DataFrame
 Row │ GEOID  NAME                  income_estimate  rent_estimate  income_moe  rent_moe 
     │ Int64  String31              String7?         String7?       String3?    String3? 
─────┼───────────────────────────────────────────────────────────────────────────────────
   1 │     1  Alabama               24476            747            136         3
   2 │     2  Alaska                32940            1200           508         13
   3 │     4  Arizona               27517            972            148         4
   4 │     5  Arkansas              23789            709            165         5
   5 │     6  California            29454