feat: add default engine in api

[eddycharly]

Explanation

Add default engine in api.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 23.16%. Comparing base (5e1c8d5) to head (4098133).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/apis/policy/v1alpha1/zz_generated.deepcopy.go	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #485      +/-   ##
==========================================
- Coverage   23.25%   23.16%   -0.09%     
==========================================
  Files          86       86              
  Lines        4047     4062      +15     
==========================================
  Hits          941      941              
- Misses       3021     3036      +15     
  Partials       85       85              

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