Fetches custom field values and pivots them so each deal is one row and each custom field is a column. Column names are the field labels.
Examples
if (FALSE) { # \dontrun{
# Wide format custom fields for all deals
cf <- ac_deal_custom_fields_wide()
# For specific deals
cf <- ac_deal_custom_fields_wide(deal_id = c("123", "456"))
} # }
