externalize handler interface implementation

[varshaprasad96]

This would help in removing the duplicate handler
interface implmentation in operator-controller.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 14.44%. Comparing base (2cb02e5) to head (e940f43).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...l/controllers/bundledeployment/bundledeployment.go	0.00%	3 Missing ⚠️
cmd/core/main.go	0.00%	2 Missing ⚠️
cmd/helm/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
+ Coverage   14.41%   14.44%   +0.03%     
==========================================
  Files          41       41              
  Lines        2553     2554       +1     
==========================================
+ Hits          368      369       +1     
  Misses       2128     2128              
  Partials       57       57              

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