fix(ApplicationCommandOptions): ensure toJSON return is valid

[vladfrangu]

Please describe the changes this PR makes and why it should be merged:

Small mistake in number options made max and minValues to not get properly passed to api snake_case properties. This PR fixes that and also adds tests t

Status and versioning classification:

• Code changes have been tested, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR includes breaking changes (methods removed or renamed, parameters moved or removed) ⭐ (technically this was private properties that are now also public...so it's not breaking per say)

[codecov-commenter]

Codecov Report

Merging #69 (695a88d) into main (481e1f8) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #69   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          306       306           
  Branches        42        42           
=========================================
  Hits           306       306           

Impacted Files	Coverage Δ
...actions/slashCommands/mixins/NameAndDescription.ts	100.00% <ø> (ø)
src/interactions/slashCommands/options/integer.ts	100.00% <100.00%> (ø)
src/interactions/slashCommands/options/number.ts	100.00% <100.00%> (ø)

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