feat(dashboard,js-sdk,types): ability to add refund reason and note (#8466)

what: 

- adds ability to add refund reason and note to a refund

<img width="524" alt="Screenshot 2024-08-06 at 13 06 59" src="https://github.com/user-attachments/assets/51537e9b-170b-4dd6-9de5-6bdea5e26822">

<img width="1090" alt="Screenshot 2024-08-06 at 12 57 18" src="https://github.com/user-attachments/assets/70bc84a4-5ebf-43e9-8416-370fd37ba615">

<img width="247" alt="Screenshot 2024-08-06 at 13 08 46" src="https://github.com/user-attachments/assets/b1dc1d83-7fb8-4af5-9a5b-fddb63ff1812">

packages/core/js-sdk/src/admin/index.ts

@@ -18,6 +18,7 @@ import { ProductCollection } from "./product-collection"
 import { ProductTag } from "./product-tag"
 import { ProductType } from "./product-type"
 import { ProductVariant } from "./product-variant"
+import { RefundReason } from "./refund-reasons"
 import { Region } from "./region"
 import { Return } from "./return"
 import { ReturnReason } from "./return-reason"
@@ -63,6 +64,7 @@ export class Admin {
   public currency: Currency
   public payment: Payment
   public productVariant: ProductVariant
+  public refundReason: RefundReason
 
   constructor(client: Client) {
     this.invite = new Invite(client)
@@ -96,5 +98,6 @@ export class Admin {
     this.currency = new Currency(client)
     this.payment = new Payment(client)
     this.productVariant = new ProductVariant(client)
+    this.refundReason = new RefundReason(client)
   }
 }

packages/core/js-sdk/src/admin/refund-reasons.ts

@@ -0,0 +1,20 @@
+import { HttpTypes } from "@medusajs/types"
+import { Client } from "../client"
+import { ClientHeaders } from "../types"
+
+export class RefundReason {
+  private client: Client
+  constructor(client: Client) {
+    this.client = client
+  }
+
+  async list(query?: HttpTypes.RefundReasonFilters, headers?: ClientHeaders) {
+    return await this.client.fetch<HttpTypes.RefundReasonsResponse>(
+      `/admin/refund-reasons`,
+      {
+        query,
+        headers,
+      }
+    )
+  }
+}