Add IsNil()

[IronGauntlets]

IsNil() checks if the underlying value of the interface is nil.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.32%. Comparing base (e55aa34) to head (3f423cc).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
utils/check.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2340      +/-   ##
==========================================
- Coverage   74.36%   74.32%   -0.05%     
==========================================
  Files         109      110       +1     
  Lines       11519    11531      +12     
==========================================
+ Hits         8566     8570       +4     
- Misses       2285     2291       +6     
- Partials      668      670       +2     

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