Add SonarQube plugin

[ricoberger]

• I added a CHANGELOG entry for this change.
• I adjusted the corresponding documentation for this change.
• I adjusted the values.yaml file and the documentation for all values.

[codecov-commenter]

Codecov Report

Merging #331 (6994933) into rework-kobs-architecture (69bd7d1) will increase coverage by 0.08%.
The diff coverage is 53.62%.

@@                     Coverage Diff                      @@
##           rework-kobs-architecture     #331      +/-   ##
============================================================
+ Coverage                     50.53%   50.62%   +0.08%     
============================================================
  Files                            72       75       +3     
  Lines                          4664     4802     +138     
============================================================
+ Hits                           2357     2431      +74     
- Misses                         2251     2313      +62     
- Partials                         56       58       +2     

Impacted Files	Coverage Δ
packages/plugin-sonarqube/cmd/sonarqube.go	35.29% <35.29%> (ø)
packages/plugin-sonarqube/pkg/instance/instance.go	54.54% <54.54%> (ø)
packages/plugin-sonarqube/pkg/instance/request.go	100.00% <100.00%> (ø)

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