feat: Add exchange return shipping (#8108)

* wip

* finalize tests

* feat: Add exchange return shipping

* add shipping to preview

* test input

* move utils and ignore already inserted shipping method

* use custom price

---------

Co-authored-by: Carlos R. L. Rodrigues <rodrigolr@gmail.com>

packages/modules/order/src/migrations/Migration20240715102100.ts

@@ -0,0 +1,12 @@
+import { Migration } from "@mikro-orm/migrations"
+
+export class Migration20240715102100 extends Migration {
+  async up(): Promise<void> {
+    const sql = `
+      ALTER TABLE "return"
+        ADD COLUMN if NOT exists "location_id" TEXT NULL;
+    `
+
+    this.addSql(sql)
+  }
+}