Add informative errors when user tries to do things like make sex numeric

[mbcann01]

For example

df <- data.frame(x = letters, y = 1:26)
df <- cb_add_col_attributes(df, x, col_type = "numeric")
codebook(df)

Returns the error

Error in `dplyr::mutate()`:
! Problem while computing `..1 = dplyr::across(dplyr::everything(), round, digits = digits)`.
Caused by error in `across()`:
! Problem while computing column `Min`.
Caused by error in `fn()`:
! non-numeric argument to mathematical function

We should figure out a way to intercept it and give something more informative.