refactor: migrate pricing entities to DML models (#10335)

Fixes: FRMW-2810

## Breaking changes
There is only one breaking change

- The `min_quantity` and `max_quantity` properties are now consistently typed as numbers. Earlier, it was [typed as numbers](https://github.com/medusajs/medusa/blob/develop/integration-tests/http/__tests__/price-list/admin/price-list.spec.ts#L68-L69) in some API responses and as [string in others](https://github.com/medusajs/medusa/blob/develop/integration-tests/http/__tests__/price-list/admin/price-list.spec.ts#L186-L187). I did not go to the bottom of this inconsistency, but the tests reveals them.

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

packages/modules/pricing/integration-tests/__fixtures__/price-rule/index.ts

@@ -2,6 +2,7 @@ import { PriceRule } from "@models"
 
 import { CreatePriceRuleDTO } from "@medusajs/framework/types"
 import { SqlEntityManager } from "@mikro-orm/postgresql"
+import { toMikroORMEntity } from "@medusajs/framework/utils"
 import { defaultPriceRuleData } from "./data"
 
 export * from "./data"
@@ -20,7 +21,10 @@ export async function createPriceRules(
     priceRuleDataClone.attribute = priceRuleDataClone.attribute
     priceRuleDataClone.price_id = priceRuleDataClone.price_id
 
-    const priceRule = manager.create(PriceRule, priceRuleDataClone)
+    const priceRule = manager.create(
+      toMikroORMEntity(PriceRule),
+      priceRuleDataClone
+    )
 
     priceRules.push(priceRule)
   }