feat(operator): implement basic fact operator

[Molter73]

Description

Still a WIP and more of an experiment than production ready operator.

Checklist

• Patch has a change log entry OR does not need one.
• Investigated and inspected CI test results
• Updated documentation accordingly

Automated testing

• Added unit tests
• Added integration tests
• Added regression tests

If any of these don't apply, please comment below.

Testing Performed

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 38.54545% with 169 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.16%. Comparing base (0e7b1cb) to head (b4154c7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
fact-operator/src/spec.rs	0.00%	114 Missing ⚠️
fact-operator/src/lib.rs	0.00%	47 Missing ⚠️
fact-core/src/lib.rs	0.00%	3 Missing ⚠️
fact-operator/src/main.rs	0.00%	3 Missing ⚠️
fact/src/lib.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
+ Coverage   27.96%   29.16%   +1.20%     
==========================================
  Files          21       25       +4     
  Lines        2596     2866     +270     
  Branches     2596     2866     +270     
==========================================
+ Hits          726      836     +110     
- Misses       1867     2027     +160     
  Partials        3        3              

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