feat(pricing,utils,types): add operator field to price rule (#10315)

what:

- adds an operator field to price rule with specific operator fields

RESOLVES CMRC-746

packages/core/utils/src/pricing/enums.ts

@@ -0,0 +1,7 @@
+export enum PricingRuleOperator {
+  GTE = "gte",
+  LTE = "lte",
+  GT = "gt",
+  LT = "lt",
+  EQ = "eq",
+}

packages/core/utils/src/pricing/index.ts

@@ -1,3 +1,4 @@
 export * from "./builders"
-export * from "./price-list"
+export * from "./enums"
 export * from "./events"
+export * from "./price-list"