feat(medusa-js): add axios adapter to config (#6214)

**What**

- Adds the ability to pass an Axios adapter through the client's config.

**Why**

- When using NextJS with the edge runtime for deployment on Cloudflare Pages, for example, Axios does not work. Therefore, it is necessary to pass an adapter like [@vespaiach/axios-fetch-adapter](https://github.com/vespaiach/axios-fetch-adapter).

**How**

- Receives the **axiosAdapter** in the config and implements it when creating the **axiosClient**.

Closes #6133

packages/medusa-js/src/request.ts

@@ -1,4 +1,9 @@
-import axios, { AxiosError, AxiosInstance, AxiosRequestHeaders } from "axios"
+import axios, {
+  AxiosAdapter,
+  AxiosError,
+  AxiosInstance,
+  AxiosRequestHeaders,
+} from "axios"
 import * as rax from "retry-axios"
 import { v4 as uuidv4 } from "uuid"
 
@@ -18,11 +23,12 @@ export interface Config {
   apiKey?: string
   publishableApiKey?: string
   customHeaders?: Record<string, any>
+  axiosAdapter?: AxiosAdapter
 }
 
 /**
  * @interface
- * 
+ *
  * Options to pass to requests sent to custom API Routes
  */
 export interface RequestOptions {
@@ -180,6 +186,7 @@ class Client {
   createClient(config: Config): AxiosInstance {
     const client = axios.create({
       baseURL: config.baseUrl,
+      adapter: config.axiosAdapter,
     })
 
     rax.attach(client)
@@ -221,8 +228,8 @@ class Client {
     options: RequestOptions = {},
     customHeaders: Record<string, any> = {}
   ): Promise<any> {
-   
+
-   customHeaders = { ...this.config.customHeaders, ...customHeaders }
+    customHeaders = { ...this.config.customHeaders, ...customHeaders }
 
     const reqOpts = {
       method,