feat: add cel language support

[eddycharly]

Explanation

Add cel language support.

[codecov]

Codecov Report

Attention: Patch coverage is 52.01794% with 107 lines in your changes missing coverage. Please review.

Project coverage is 24.11%. Comparing base (4c135bc) to head (bdc7b59).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/core/assertion/assertion.go	26.47%	24 Missing and 1 partial ⚠️
pkg/core/templating/compiler.go	60.00%	16 Missing and 8 partials ⚠️
pkg/core/projection/projection.go	14.28%	18 Missing ⚠️
pkg/core/templating/cel/val.go	42.85%	12 Missing ⚠️
pkg/core/templating/cel/env.go	59.09%	6 Missing and 3 partials ⚠️
pkg/core/templating/templating.go	50.00%	4 Missing and 2 partials ⚠️
pkg/core/templating/cel/cel.go	70.00%	2 Missing and 1 partial ⚠️
pkg/apis/policy/v1alpha1/assertion_tree.go	0.00%	2 Missing ⚠️
pkg/commands/jp/query/command.go	0.00%	2 Missing ⚠️
pkg/engine/match/match.go	33.33%	2 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #483      +/-   ##
==========================================
+ Coverage   23.39%   24.11%   +0.72%     
==========================================
  Files          87       91       +4     
  Lines        4100     4205     +105     
==========================================
+ Hits          959     1014      +55     
- Misses       3053     3093      +40     
- Partials       88       98      +10     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.