refactor: remove NonNullObject

[imranbarbhuiya]

ref: discordjs/discord.js#8868 (comment)

[codecov-commenter]

Codecov Report

Base: 99.35% // Head: 99.35% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (fb29e0f) compared to base (ef17e9a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #227   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files          57       57           
  Lines        3397     3400    +3     
  Branches      811      811           
=======================================
+ Hits         3375     3378    +3     
  Misses         13       13           
  Partials        9        9           

Impacted Files	Coverage Δ
src/lib/Shapes.ts	100.00% <100.00%> (ø)
src/lib/util-types.ts	100.00% <100.00%> (ø)
src/validators/ObjectValidator.ts	97.86% <100.00%> (ø)

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