Add library for replaying Chrome DevTools recordings

[allansson]

Description

We're releasing a new Chrome extension that allows the DevTools Recorder to export a k6 Browser script. This PR adds a module containing the runner needed for the generated scripts.

NOTE: I added a published property to the page generator because because we don't want users to become dependent on this library unless they've used the browser extension. I also expect to be continuously updating v1.0.0 of the library while I'm testing the extension e2e, so it's a good idea to keep it hidden at least until the extension is released.

Please fill in this template.

• Use a meaningful title for the Pull Request. Include the name of the jslib added/modified.
• Fill the description section of the Pull Request.
• Test the change in your code, and ensure the npm run test command succeeds.
• Run yarn run generate-homepage locally and verify the new homepage /lib/index.html file looks legit.

Select one of these and delete the others:

If adding a new jslib:

• The Pull Request creates a /lib/{jslib_name} folder.
• The Pull Request creates a /lib/{jslib_name}/{desired_version} folder.
• The /lib/{jslib_name}/{desired_version}/index.js file containing the jslib's code bundle exists.
• The Pull Request updates the supported.json file to contain an entry for the newly added jslib and its {desired_version}, as in the following example:

{
  "{jslib_name}": {
    // Available package versions
    "versions": [
      "{desired_version}"
    ],

    // (optional) Documentation's or repository's URL
    "docs-url": "{documentation_or_repository_url}",

    // (optional) As a default, the homepage will point to
    // a package's bundle's index.js. If your package's main
    // bundle name is different; set it here (see the AWS
    // package for instance).
    "bundle-filename": "{index.js}"
}

• Tests have been added to /tests/basic.js and /tests/testSuite.js to ensure that the added jslib is importable and runnable by k6. (Did not do because the runner code exports test options that are expected to be re-exported by the test script itself, and I can't re-export it easily in the test runner script).

[allansson]

Self-review

[allansson]

There won't be docs until the extension has been released and if we keep the lib hidden, then we might not need them at all.

[allansson]

Added this to keep the lib hidden from the homepage, but available on the "CDN".

[allansson]

Tests seem to fail randomly in the crocFlow suite. Nothing in this PR could have caused that.

[w1kman]

LGTM 😗 👌🏻

[2Steaks]

LGTM 👍