Add Helm 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 #344 (4dcaaf7) into rework-kobs-architecture (630657c) will increase coverage by 1.49%.
The diff coverage is 89.40%.

@@                     Coverage Diff                      @@
##           rework-kobs-architecture     #344      +/-   ##
============================================================
+ Coverage                     45.52%   47.01%   +1.49%     
============================================================
  Files                           120      124       +4     
  Lines                          8569     8871     +302     
============================================================
+ Hits                           3901     4171     +270     
- Misses                         4584     4615      +31     
- Partials                         84       85       +1     

Impacted Files	Coverage Δ
plugins/plugin-helm/cmd/helm.go	82.94% <82.94%> (ø)
plugins/plugin-helm/pkg/client/helpers.go	90.00% <90.00%> (ø)
plugins/plugin-helm/pkg/client/client.go	100.00% <100.00%> (ø)
plugins/plugin-helm/pkg/permissions/permissions.go	100.00% <100.00%> (ø)

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