refactor: policy compilation

[eddycharly]

Explanation

Refactor policy compilation.

[codecov]

Codecov Report

Attention: Patch coverage is 49.84026% with 157 lines in your changes missing coverage. Please review.

Project coverage is 24.46%. Comparing base (9d7931b) to head (46e23a2).

Files with missing lines	Patch %	Lines
pkg/json-engine/compiler.go	45.84%	112 Missing and 38 partials ⚠️
pkg/json-engine/engine.go	82.35%	3 Missing ⚠️
pkg/apis/policy/v1alpha1/any.go	0.00%	2 Missing ⚠️
pkg/apis/policy/v1alpha1/assertion_tree.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #516      +/-   ##
==========================================
+ Coverage   21.41%   24.46%   +3.04%     
==========================================
  Files          92       92              
  Lines        4282     4333      +51     
==========================================
+ Hits          917     1060     +143     
+ Misses       3294     3164     -130     
- Partials       71      109      +38     

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