refactor: introduce matching package in core

[eddycharly]

Explanation

Introduce matching package in core.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 23.79%. Comparing base (f0e8ec8) to head (a06c2c0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/core/matching/equal.go	0.00%	2 Missing ⚠️
pkg/core/assertion/assertion.go	0.00%	1 Missing ⚠️
pkg/core/matching/match.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #502      +/-   ##
==========================================
- Coverage   24.05%   23.79%   -0.27%     
==========================================
  Files          90       90              
  Lines        4202     4202              
==========================================
- Hits         1011     1000      -11     
- Misses       3093     3105      +12     
+ Partials       98       97       -1     

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