fmt(repo): apply styler code formatting

[Collinbrown95]

Closes #5

Please feel free to propose any changes.

Test Results

==> Testing R file using 'testthat'

ℹ Loading PriceIndices

[ FAIL 0 | WARN 0 | SKIP 0 | PASS 0 ]
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 1 ]
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 2 ]
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 3 ]
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 4 ]
Test complete

Summary of Code Changes

> styler::style_pkg()
Styling  24  files:
 R/coffee.R                            ℹ 
 R/data_DOWN_UP_SIZED.R                ℹ 
 R/dataAGGR.R                          ℹ 
 R/dataCOICOP.R                        ℹ 
 R/dataMATCH.R                         ℹ 
 R/dataU.R                             ℹ 
 R/f_bilateral_indicators.R            ℹ 
 R/f_bilateral_indices.R               ℹ 
 R/f_chain_indices.R                   ℹ 
 R/f_comparing_indices.R               ℹ 
 R/f_data_processing.R                 ℹ 
 R/f_extensions_multilateral_indices.R ℹ 
 R/f_full_multilateral_indices.R       ℹ 
 R/f_general.R                         ℹ 
 R/f_internal.R                        ℹ 
 R/f_Machine_Learning.R                ℹ 
 R/f_multilateral_indicators.R         ℹ 
 R/milk.R                              ℹ 
 R/PriceIndices.R                      ℹ 
 R/sugar.R                             ℹ 
 tests/testthat.R                      ✔ 
 tests/testthat/testing_indices.R      ℹ 
 vignettes/PriceIndices.Rmd            ℹ 
 README.Rmd                            ℹ 
────────────────────────────────────────
Status  Count   Legend 
✔   1   File unchanged.
ℹ   23  File changed.
✖   0   Styling threw an error.
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Please review the changes carefully!