Adding API support for rounding functions at rate level

utils/tpdata.go

@@ -31,6 +31,8 @@ type RateSlot struct {
 	Rate           float64 // Rate applied
 	RatedUnits     int     //  Number of billing units this rate applies to
 	RateIncrements int     // This rate will apply in increments of duration
+	RoundingMethod string     // Use this method to round the cost
+	RoundingDecimals int	// Round the cost number of decimals
 	Weight         float64 // Rate's priority when dealing with grouped rates
 }