add new ExtensionPOSTAttributes field - product slug

.changeset/cyan-teeth-train.md

@@ -0,0 +1,5 @@
+---
+"@saleor/app-sdk": patch
+---
+
+Added productSlug param to ExtensionPOSTAttributes, which means types body from the Dashboard when calling extension (in product details context)

src/types.ts

@@ -343,6 +343,7 @@ export type ExtensionPOSTAttributes = {
    */
   productId?: string;
   productIds?: string[];
+  productSlug?: string;
   orderId?: string;
   customerId?: string;
   customerIds?: string[];