feat: add chart support to prometheus servicemonitor

[diegomarangoni]

With this PR, helm chart will deploy a ServiceMonitor resource capable of monitoring mergeable metrics.

[codecov]

Codecov Report

Merging #535 (77d6024) into master (e4f488c) will not change coverage.
The diff coverage is n/a.

❗ Current head 77d6024 differs from pull request most recent head 0f8585d. Consider uploading reports for the commit 0f8585d to get more accurate results

@@           Coverage Diff           @@
##           master     #535   +/-   ##
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  Coverage   91.24%   91.24%           
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  Files         103      103           
  Lines        2228     2228           
  Branches      411      411           
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  Hits         2033     2033           
  Misses        169      169           
  Partials       26       26           

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[diegomarangoni]

hey @shine2lay can I have your approval here?

[shine2lay]

@diegomarangoni hey, sorry i missed this, thanks for reminding me, i'll merge it in as soon as CI passes

[diegomarangoni]

@diegomarangoni hey, sorry i missed this, thanks for reminding me, i'll merge it in as soon as CI passes

no problem, thanks :)