Add Kubernetes storage ID validation

[slok]

Closes #179

[codecov-io]

Codecov Report

Merging #180 into master will increase coverage by 0.87%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
+ Coverage   75.77%   76.65%   +0.87%     
==========================================
  Files          27       27              
  Lines        1218     1221       +3     
==========================================
+ Hits          923      936      +13     
+ Misses        218      213       -5     
+ Partials       77       72       -5     

Impacted Files	Coverage Δ
internal/storage/kubernetes/kubernetes.go	92.30% <100.00%> (+8.05%)	⬆️

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