fix: use setupServer to support Next.js

[homerchen19]

• I added the following code to the template in order to support SSR with Next.js

if (typeof window === 'undefined') {
  const { setupServer } = require('msw/node');
  const server = setupServer(...handlers);
  server.listen();
} else {
  const worker = setupWorker(...handlers);
  worker.start();
}

• It's pretty much the same as the example from Next.js
• Updated the version of faker.js and regenerated mock.js in /example

[zoubingwu]

LGTM, thanks for your contribution!