feat: add median implementation

[qalisander]

Resolves #93

PR Checklist

• Tests
• Documentation
• Changelog

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.47%. Comparing base (1426e0a) to head (34146b5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   89.74%   85.47%   -4.28%     
==========================================
  Files          19       12       -7     
  Lines        1785     1301     -484     
  Branches      484      445      -39     
==========================================
- Hits         1602     1112     -490     
- Misses        168      177       +9     
+ Partials       15       12       -3     

Flag	Coverage Δ
contracts/access	?
math/core	85.47% <ø> (-0.65%)	⬇️
math/fixed_point	?

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