Revisit faker.js example in the docs to generate realistic data

[immavalls]

Based on https://community.k6.io/t/a-newer-version-of-faker/5516/3, I would suggest we consider if the example we have in https://k6.io/docs/examples/, which points to https://github.com/grafana/k6-example-data-generation, is currently the best. Alternatives:

• Document a simple example like the one below. This has at least a couple of caveats (high memory usage, and the need to fix JavaScript spread operator throws error with params object k6#824 (comment) to support the newer version of faker - the old one is no longer maintained)

  import faker from 'https://cdnjs.cloudflare.com/ajax/libs/Faker/3.1.0/faker.min.js'
  
  export default function () {
      console.log(faker.name.firstName(), faker.name.lastName());
  }

• Implement Faker with SharedArray to use less memory jslib.k6.io#84, an alternative using SharedArray.

• Point to use the extension https://github.com/szkiba/xk6-faker?

• Other alternatives?