Add Flux 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 #345 (4e05031) into rework-kobs-architecture (ac543b3) will decrease coverage by 0.53%.
The diff coverage is 10.60%.

@@                     Coverage Diff                      @@
##           rework-kobs-architecture     #345      +/-   ##
============================================================
- Coverage                     47.01%   46.48%   -0.54%     
============================================================
  Files                           124      126       +2     
  Lines                          8871     9003     +132     
============================================================
+ Hits                           4171     4185      +14     
- Misses                         4615     4733     +118     
  Partials                         85       85              

Impacted Files	Coverage Δ
plugins/plugin-flux/pkg/sync/sync.go	0.00% <0.00%> (ø)
plugins/plugin-flux/cmd/flux.go	17.94% <17.94%> (ø)

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