PredictionPreference type 
Defines values for PredictionPreference. 
KnownPredictionPreference can be used interchangeably with PredictionPreference,
this enum contains the known values that the service supports.
Known values supported by the service
Balanced: Balance between cost and performance. 
MostCostEffective: Optimizes for cost over performance. 
MoreCostEffective: Halfway through cost and balanced. 
MorePerformance: Halfway through balanced and performance. 
BestPerformance: Optimizes for performance over cost.
type PredictionPreference = string