K8s discovery

[mariomac]

Missing:

• Documentation
• Integration tests
• K8s-based decoration of namespaces and service name

[codecov-commenter]

Codecov Report

Attention: 100 lines in your changes are missing coverage. Please review.

Comparison is base (d9269ab) 78.30% compared to head (625979e) 44.46%.

Files	Patch %	Lines
pkg/internal/discover/watcher_kube.go	75.00%	45 Missing and 4 partials ⚠️
pkg/internal/discover/finder.go	0.00%	11 Missing ⚠️
pkg/internal/kube/informer.go	71.42%	8 Missing and 2 partials ⚠️
pkg/internal/export/prom/prom.go	0.00%	9 Missing ⚠️
pkg/internal/discover/watcher_proc.go	56.25%	7 Missing ⚠️
pkg/internal/transform/kube/db.go	0.00%	7 Missing ⚠️
pkg/internal/discover/matcher.go	90.62%	2 Missing and 1 partial ⚠️
pkg/internal/discover/services/criteria.go	88.23%	2 Missing ⚠️
pkg/internal/transform/k8s.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #511       +/-   ##
===========================================
- Coverage   78.30%   44.46%   -33.85%     
===========================================
  Files          68       67        -1     
  Lines        5476     5573       +97     
===========================================
- Hits         4288     2478     -1810     
- Misses        964     2943     +1979     
+ Partials      224      152       -72     

Flag	Coverage Δ
integration-test	?
unittests	44.46% <72.89%> (+4.11%)	⬆️

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