Replace readr with fread

[rrchai]

As developers of DCA, you probably have seen the below warning:

Warning: Setting row names on a tibble is deprecated.

The warning is coming from when we try to add rownames to tibble (default output data's type from readr::read_csv). The rownames is currently used to match the spreadsheet row index with preview table row index.

While we could avoid using rownames in tibble or find a solution to avoid ^ warning, we could just use fread instead to further improve the performance (ref):

1. it is faster than readr
2. it requires less memory usage

AC:
[ ] replace readrwith fread function to read csv
[ ] ensure that the way we use the row index in preview table or error message is behaved as before