add capacityMode (#1826)

* add capacityMode

* add check for capacityMode for serverless

src/Common/Constants.ts

@@ -90,6 +90,11 @@ export class CapabilityNames {
   public static readonly EnableServerless: string = "EnableServerless";
 }
 
+export enum CapacityMode {
+  Provisioned = "Provisioned",
+  Serverless = "Serverless",
+}
+
 // flight names returned from the portal are always lowercase
 export class Flights {
   public static readonly SettingsV2 = "settingsv2";