feat: add median implementation

[qalisander]

Resolves #93

PR Checklist

• Tests
• Documentation
• Changelog

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/median

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.27%. Comparing base (d463248) to head (df5fcf6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   95.29%   95.27%   -0.03%     
==========================================
  Files          19       19              
  Lines        1468     1461       -7     
  Branches      385      383       -2     
==========================================
- Hits         1399     1392       -7     
- Misses         48       54       +6     
+ Partials       21       15       -6     

Flag	Coverage Δ
contracts/access	50.19% <ø> (ø)
math/core	94.17% <ø> (-0.04%)	⬇️
math/fixed_point	60.84% <ø> (ø)

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