refactor: move hash in utils

[eddycharly]

Explanation

Move hash in utils.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 8 lines in your changes missing coverage. Please review.

Project coverage is 23.84%. Comparing base (dc9a4be) to head (b8844e2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/utils/hash/hash.go	40.00%	4 Missing and 2 partials ⚠️
pkg/apis/policy/v1alpha1/assertion_tree.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #504      +/-   ##
==========================================
+ Coverage   23.74%   23.84%   +0.09%     
==========================================
  Files          91       92       +1     
  Lines        4236     4236              
==========================================
+ Hits         1006     1010       +4     
+ Misses       3133     3127       -6     
- Partials       97       99       +2     

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