[raygui] Add new port

[ex-purple]

Fixes #22935

• Changes comply with the maintainer guide
• The name of the port matches an existing name for this component on https://repology.org/ if possible, and/or is strongly associated with that component on search engines.
• Optional dependencies are resolved in exactly one way. For example, if the component is built with CMake, all find_package calls are REQUIRED, are satisfied by vcpkg.json's declared dependencies, or disabled with CMAKE_DISABLE_FIND_PACKAGE_Xxx
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says.
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is accurate. See docs/examples/adding-an-explicit-usage.md for context.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is in the new port's versions file.
• Only one version is added to each modified port's versions file.

[Adela0814]

Tested usage on x64-windows.

[github-actions]

This is a new experimental fast check for PR issues. Please let us know if this bot is helpful!

PRs must add only one version and must not modify any published versions

When making any changes to a library, the version or port-version in vcpkg.json or CONTROL must be modified.

error: checked-in files for raygui have changed but the version was not updated
version: 3.2
old SHA: 042db3576c5d79a6b7c92388ab28d7bcc4bd437d
new SHA: 96eade6012fdd28a62fd21748edfd06d63674317
Did you remember to update the version or port version?
Use --overwrite-version to bypass this check
***No files were updated***

[BillyONeal]

Thanks for the new port!