Move the url jslib to a dedicated repo

[oleiade]

It has been decided internally to not hold any actual jslib code in the repository itself anymore. As a result, we should move the [url](https://github.com/grafana/jslib.k6.io/tree/main/lib/url jslib into a dedicated repository.

Thus we should go through the necessary steps to include the url jslib from its dedicated repo as follows:

• create a dedicated repository for the url jslib library
• create a build and release for its latest version
• include this version and its build files in the jslib repo
• remove the actual summary code present in the repo

🖖🏻

[oleiade]

Done ✅

Please find the code in the k6-jslib-url repository.