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

TODO(replace-me)
Use this space to explain how you tested your PR, or, if you didn't test it, why you did not do so. (Valid reasons include "CI is sufficient" or "No testable changes")
In addition to reviewing your code, reviewers must also review your testing instructions, and make sure they are sufficient.

For more details, ref the Confluence page about this section.

[coderabbitai]

Important

Draft PR not reviewed

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• Trigger a manual review

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mauro/feat/fact-operator

---

_{Comment @coderabbitai help to get the list of available commands.}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.00000% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.63%. Comparing base (52be292) to head (651a9e7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
fact-operator/src/lib.rs	0.00%	47 Missing ⚠️
fact-core/src/config/mod.rs	91.47%	15 Missing ⚠️
fact-operator/src/spec.rs	98.14%	3 Missing and 2 partials ⚠️
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   35.97%   42.63%   +6.66%     
==========================================
  Files          22       26       +4     
  Lines        3180     3675     +495     
  Branches     3180     3675     +495     
==========================================
+ Hits         1144     1567     +423     
- Misses       2033     2103      +70     
- Partials        3        5       +2     

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