feat(core-flows,pricing,medusa,pricing,types,utils): Price List Prices can have their own rules (#5752)

**What**
- Add price-rules for prices in price-lists
- make rules object optional when creating prices

**Why**
- more price granularity

Co-authored-by: Philip Korsholm <88927411+pKorsholm@users.noreply.github.com>

packages/pricing/integration-tests/__fixtures__/price-list/data.ts

@@ -3,12 +3,12 @@ export const defaultPriceListData = [
     id: "price-list-1",
     title: "Price List 1",
     description: "test",
-    number_rules: 0,
+    rules_count: 0,
   },
   {
     id: "price-list-2",
     title: "Price List 2",
     description: "test",
-    number_rules: 0,
+    rules_count: 0,
   },
 ]

packages/pricing/integration-tests/__fixtures__/price-set-money-amount/data.ts

@@ -4,20 +4,20 @@ export const defaultPriceSetMoneyAmountsData = [
     title: "price set money amount USD",
     price_set: "price-set-1",
     money_amount: "money-amount-USD",
-    number_rules: 1,
+    rules_count: 1,
   },
   {
     id: "price-set-money-amount-EUR",
     title: "price set money amount EUR",
     price_set: "price-set-2",
     money_amount: "money-amount-EUR",
-    number_rules: 1,
+    rules_count: 1,
   },
   {
     id: "price-set-money-amount-CAD",
     title: "price set money amount CAD",
     price_set: "price-set-3",
     money_amount: "money-amount-CAD",
-    number_rules: 1,
+    rules_count: 1,
   },
 ]