feat(medusa, core-flows, fulfillment): calculate SO price endpoint (#10532)

**What**
- endpoint + flow for fetching calculated price for a shipping option

---

CLOSES CMRC-777

packages/modules/fulfillment/src/services/fulfillment-module-service.ts

@@ -1,4 +1,5 @@
 import {
+  CalculatedShippingOptionPrice,
   Context,
   DAL,
   FilterableFulfillmentSetProps,
@@ -1998,6 +1999,21 @@ export default class FulfillmentModuleService
     return await promiseAll(promises)
   }
 
+  async calculateShippingOptionsPrices(
+    shippingOptionsData: FulfillmentTypes.CalculateShippingOptionPriceDTO[]
+  ): Promise<CalculatedShippingOptionPrice[]> {
+    const promises = shippingOptionsData.map((data) =>
+      this.fulfillmentProviderService_.calculatePrice(
+        data.provider_id,
+        data.optionData,
+        data.data,
+        data.context
+      )
+    )
+
+    return await promiseAll(promises)
+  }
+
   @InjectTransactionManager()
   // @ts-expect-error
   async deleteShippingProfiles(