refactor: scalar projection

[eddycharly]

Explanation

Refactor scalar projection.

[codecov]

Codecov Report

Attention: Patch coverage is 38.15789% with 47 lines in your changes missing coverage. Please review.

Project coverage is 24.21%. Comparing base (6397e6a) to head (57a9014).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/core/projection/projection.go	2.94%	33 Missing ⚠️
pkg/json-engine/engine.go	64.70%	4 Missing and 2 partials ⚠️
pkg/apis/policy/v1alpha1/any.go	70.58%	4 Missing and 1 partial ⚠️
pkg/commands/jp/query/command.go	0.00%	1 Missing ⚠️
pkg/server/playground/handler.go	0.00%	1 Missing ⚠️
pkg/server/scan/handler.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #510      +/-   ##
==========================================
- Coverage   24.30%   24.21%   -0.09%     
==========================================
  Files          92       92              
  Lines        4266     4290      +24     
==========================================
+ Hits         1037     1039       +2     
- Misses       3125     3151      +26     
+ Partials      104      100       -4     

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