chore: set up MSW

This will help with mocking requests and responses from external services.

src/mocks/handlers.ts

@@ -0,0 +1 @@
+export const handlers = [];

src/mocks/index.ts

@@ -0,0 +1,5 @@
+import { setupServer } from "msw/node";
+
+import { handlers } from "./handlers";
+
+export const server = setupServer(...handlers);