move some of the Validators to an ExtraValidators file

[phlptp]

Rework some of the validator locations, add documentation, and fix some lingering issues with validators.
The extra will will enable additions of some new validators and reduce compile times for those that are not needed.

[codecov]

Codecov Report

❌ Patch coverage is 98.36601% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.90%. Comparing base (e4ee3af) to head (03ce593).
⚠️ Report is 114 commits behind head on main.

Files with missing lines	Patch %	Lines
include/CLI/impl/Option_inl.hpp	90.90%	4 Missing ⚠️
include/CLI/impl/ExtraValidators_inl.hpp	97.82%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #1192      +/-   ##
===========================================
- Coverage   100.00%   99.90%   -0.10%     
===========================================
  Files           17       19       +2     
  Lines         4546     5193     +647     
  Branches         0     1062    +1062     
===========================================
+ Hits          4546     5188     +642     
- Misses           0        5       +5     

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[phlptp]

Will Fix #1191

[phlptp]

@henryiii I think you are going to need to modify the codacy configuration on their website, I don't think I can fix the false positives on codacy in a configuration, so that will need to be handled by the administrator of the codacy configuration, which I think is you. I think we might want to just disable cppcheck on codacy, I am not seeing it providing much value over the other static checking we are doing.