Rework kobs architecture watcher

[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 #317 (67d8785) into rework-kobs-architecture (3e8982c) will increase coverage by 0.59%.
The diff coverage is 47.82%.

@@                     Coverage Diff                      @@
##           rework-kobs-architecture     #317      +/-   ##
============================================================
+ Coverage                     44.70%   45.29%   +0.59%     
============================================================
  Files                            46       50       +4     
  Lines                          2691     3009     +318     
============================================================
+ Hits                           1203     1363     +160     
- Misses                         1426     1561     +135     
- Partials                         62       85      +23     

Impacted Files	Coverage Δ
cmd/kobs/hub/config/config.go	100.00% <ø> (ø)
pkg/api/hub/hub.go	0.00% <0.00%> (ø)
pkg/hub/watcher/watcher.go	21.23% <21.23%> (ø)
cmd/kobs/hub/hub.go	21.48% <21.95%> (+3.37%)	⬆️
pkg/hub/store/store.go	46.34% <45.00%> (-1.35%)	⬇️
pkg/hub/watcher/request.go	90.32% <90.32%> (ø)
pkg/hub/watcher/instrument.go	100.00% <100.00%> (ø)
pkg/hub/watcher/worker/worker.go	100.00% <100.00%> (ø)

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