feat(pricing): add price rule entity (#5050)

**What**
- add price-rule entity to pricing module

blocked by #4977 

Fixes CORE-1497

Co-authored-by: Riqwan Thamir <5105988+riqwan@users.noreply.github.com>
Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

packages/pricing/src/loaders/container.ts

@@ -1,10 +1,10 @@
-import { ModulesSdkTypes } from "@medusajs/types"
 import * as defaultRepositories from "@repositories"
 import * as defaultServices from "@services"
 
 import { LoaderOptions } from "@medusajs/modules-sdk"
-import { loadCustomRepositories } from "@medusajs/utils"
+import { ModulesSdkTypes } from "@medusajs/types"
 import { asClass } from "awilix"
+import { loadCustomRepositories } from "@medusajs/utils"
 
 export default async ({
   container,
@@ -22,6 +22,7 @@ export default async ({
     moneyAmountService: asClass(defaultServices.MoneyAmountService).singleton(),
     priceSetService: asClass(defaultServices.PriceSetService).singleton(),
     ruleTypeService: asClass(defaultServices.RuleTypeService).singleton(),
+    priceRuleService: asClass(defaultServices.PriceRuleService).singleton(),
   })
 
   if (customRepositories) {
@@ -50,5 +51,8 @@ function loadDefaultRepositories({ container }) {
     ruleTypeRepository: asClass(
       defaultRepositories.RuleTypeRepository
     ).singleton(),
+    priceRuleRepository: asClass(
+      defaultRepositories.PriceRuleRepository
+    ).singleton(),
   })
 }