Allow user-defined options to shadow implicit ones (--help, --version)

[Tyrrrz]

Closes #156

[Copilot]

Pull Request Overview

This PR enables user-defined options to override the implicit "--help" and "--version" options by renaming the implicit options and updating their inclusion logic.

• Rename “HelpOption” and “VersionOption” to “ImplicitHelpOption” and “ImplicitVersionOption” respectively.
• Update the command schema logic to conditionally include implicit options based on whether a command explicitly defines them.
• Update tests to verify both the positive and negative binding scenarios with the new implicit options.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
CliFx/Schema/OptionSchema.cs	Renamed static properties to better reflect their implicit usage.
CliFx/Schema/CommandSchema.cs	Modified logic to include implicit options only when not overridden by command-defined options.
CliFx/Input/OptionInput.cs	Updated option checks to use implicit options.
CliFx/CliApplication.cs	Adjusted help and version option checks to match the renamed properties.
CliFx.Tests/OptionBindingSpecs.cs	Added tests for binding when using identifiers that match implicit options.
CliFx.Tests/HelpTextSpecs.cs	Updated test names and behaviors to validate the new implicit option behavior.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.91%. Comparing base (3fb2a23) to head (d54aa58).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
+ Coverage   92.89%   92.91%   +0.01%     
==========================================
  Files          84       84              
  Lines        2279     2285       +6     
  Branches      336      339       +3     
==========================================
+ Hits         2117     2123       +6     
  Misses         94       94              
  Partials       68       68              

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