chore: add fetch funtcion & add tests to helper module

packages/helper/fetch.test.ts

@@ -0,0 +1,11 @@
+import { fetch } from "./fetch"
+
+describe("myFetch()", () => {
+  it("should return data from the server", async () => {
+    const response = await fetch("https://example.com")
+    expect(response.ok).toBe(true)
+    expect(response.status).toBe(200)
+    const data = await response.text()
+    expect(data).toMatch("Example Domain")
+  })
+})