[Luau] Add new port to luau

[sssooonnnggg]

• 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 adding-usage 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.

[FrankXie05]

Note: I will be converting your PR to draft status. When you respond, please revert to "ready for review".
That way, I can be aware that you've responded since you can't modify the tags.

[sssooonnnggg]

Thanks for the review，make namespace unofficial now. If the official repo adds official exports in the future, we can remove this patch. cc @FrankXie05 @dg0yt

[dg0yt]

Required package name: unofficial-luau
Required namespace: unofficial::luau::

FTR I wonder if this can be installed simultaneously with lua or luajit.

[sssooonnnggg]

@dg0yt Yes, I have tested luau can be installed simultaneously with lua and luajit. Their libs have different names and headers are installed into different sub folders:

• lua => include/...
• luau => include/luau/...
• luajit => include/luajit/...

[sssooonnnggg]

Hi, can you help with reviewing again? 😊 @FrankXie05

[FrankXie05]

The usage has been tested successfully locally on x64-windows.