Add metric for disabled/ignored rules in SonarQube

[javanegmond]

Is your feature request related to a problem? Please describe.
Sometimes a team may simply not agree with specific Sonar rules and disable them (through configuration) or ignore them (either through configuration or through using the 'ignore' tag). It would be nice to have an overview in Quality Time of the disabled rules.

Describe the solution you'd like
A new metric that lists which rules have been disabled/ignored etc. Could perhaps be filtered like we already can filter SonarQube issues.

Describe alternatives you've considered
None.

Additional context
None.

[fniessink]

Tasks

• Add a new metric "Enabled/disabled/changed rules"
• Add SonarQube as supported source
• Add a parameter "Project key" (generalising this zero or more project keys is out of scope).
• Use the api/qualityprofiles/search endpoint to lookup the quality profiles for the configured project. Assumption: we only get the quality profiles for languages actually used in the project.
• Compare the non-default quality profiles with the default quality profiles, per language.
• For each language used in the project, create a measurement entity that links to the compare page for the non-default and default profiles.