[infra] add sub git module hertzbeat-helm-chart

[tomsun28]

What's changed?

Checklist

• I have read the Contributing Guide
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

Add or update API

• I have added the necessary e2e tests and all cases have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.02%. Comparing base (3a2350b) to head (9b63894).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2522   +/-   ##
=========================================
  Coverage     29.02%   29.02%           
  Complexity     1624     1624           
=========================================
  Files           429      429           
  Lines         17704    17704           
  Branches       2307     2307           
=========================================
+ Hits           5138     5139    +1     
+ Misses        11983    11982    -1     
  Partials        583      583           

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