feat(medusa,types): product variant store endpoints (#13730)

* wip(medusa): product variant store endpoints

* chore: refactor types

* chore: changesets

* fix: address feedback 1

* feat: load images for variants by default

* fix: use query.graph directly instead of refetchEntity

* feat: enable cache for variants endpoint

packages/core/types/src/http/product/store/responses.ts

@@ -1,5 +1,5 @@
 import { PaginatedResponse } from "../../common"
-import { StoreProduct } from "../store"
+import { StoreProduct, StoreProductVariant } from "../store"
 
 export interface StoreProductResponse {
   /**
@@ -14,3 +14,17 @@ export type StoreProductListResponse = PaginatedResponse<{
    */
   products: StoreProduct[]
 }>
+
+export interface StoreProductVariantResponse {
+  /**
+   * The product variant's details.
+   */
+  variant: StoreProductVariant
+}
+
+export type StoreProductVariantListResponse = PaginatedResponse<{
+  /**
+   * The list of product variants.
+   */
+  variants: StoreProductVariant[]
+}>