feat: number assertions for num-bigint::BigInt and num-bigint::BigUint

[haraldmaida]

Implemented number specific assertions for BigInt and BigUint of the num-bigint crate.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.56%. Comparing base (5196886) to head (a6f87b5).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   96.50%   96.56%   +0.06%     
==========================================
  Files          27       28       +1     
  Lines        3231     3291      +60     
  Branches     3231     3291      +60     
==========================================
+ Hits         3118     3178      +60     
  Misses        109      109              
  Partials        4        4              

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