Integrate Sonarcube in TER search

Marketing Factory provides a Sonarcube installation which tests all extensions uploaded to TER: https://ter-sonarqube.marketing-factory.de/projects

In a first step it would be very helpful to add a link "Code Analysis" to the sidebar in the detail view which leads to the single view of sonarcube for the specific extension.

For the long term future it would be awesome if we can provide our own Sonarcube installation with an official rule set. Maybe it's even possible to directly integrate the rating of an extension within the TER detail view.

This feature would help people who evaluate different extensions to make an easier decision which extension to take.