chore(): Reorganize modules (#7210)

**What**
Move all modules to the modules directory

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

@@ -0,0 +1 @@
+export * from "./validate-price-list-dates"

packages/modules/pricing/src/utils/validate-price-list-dates.ts

@@ -0,0 +1,20 @@
+import { isDate, MedusaError } from "@medusajs/utils"
+
+export const validatePriceListDates = (priceListData: {
+  starts_at?: Date | string | null
+  ends_at?: Date | string | null
+}) => {
+  if (!!priceListData.starts_at && !isDate(priceListData.starts_at)) {
+    throw new MedusaError(
+      MedusaError.Types.INVALID_DATA,
+      `Cannot set price list starts at with with invalid date string: ${priceListData.starts_at}`
+    )
+  }
+
+  if (!!priceListData.ends_at && !isDate(priceListData.ends_at)) {
+    throw new MedusaError(
+      MedusaError.Types.INVALID_DATA,
+      `Cannot set price list ends at with with invalid date string: ${priceListData.ends_at}`
+    )
+  }
+}