Allow for "measuring" the latest available version of a software product

[fniessink]

New metric: "latest available version", similar to "source version". Collectors: GitHub tags/releases, Docker Hub tags, PyPI, npm. Requested by @denniebouman.

[Sebastiaan127001]

This would be very useful also to notify users of a new Quality-time version. Currently, this requires a lot of manual work for quality managers.

I use the below urls to quickly check if a new version is available. https://github.com/dependency-check/DependencyCheck/releases#:~:text=latest https://github.com/zaproxy/zaproxy/releases#:~:text=latest https://github.com/dequelabs/axe-core/releases#:~:text=latest https://github.com/DependencyTrack/dependency-track/releases#:~:text=latest