Add K8s metadata cache service to helm chart

[mariomac]

To enable it, just add this section to the values.yml:

k8sCache:
  replicas: 1
  image:
    tag: main

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.62%. Comparing base (56e5b9b) to head (0b5d2a8).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1296      +/-   ##
==========================================
+ Coverage   80.56%   80.62%   +0.06%     
==========================================
  Files         141      141              
  Lines       14217    14217              
==========================================
+ Hits        11454    11463       +9     
+ Misses       2223     2215       -8     
+ Partials      540      539       -1     

Flag	Coverage Δ
integration-test	58.79% <ø> (+0.02%)	⬆️
k8s-integration-test	58.56% <ø> (+0.06%)	⬆️
oats-test	34.99% <ø> (-0.03%)	⬇️
unittests	52.59% <ø> (+0.03%)	⬆️

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[grcevski]

LGTM!