Add prebuild Windows binaries

[kelteseth]

Is your feature request related to a problem? Please describe.
Building SwiftGodot takes about 13 minutes on my 16 core Ryzen. This is really more of a SwiftPM issue, but let's track it also here.

Describe the solution you'd like
I would like to download prebuild SwiftGodot bins for Windows, similar how it is already possible on mac.

Describe alternatives you've considered
I have not found any solution to this issue. A forum thread from 2022 asked about Windows binaryTarget and a proposal for linux or none mac binary dependencies. There is also Package Manager Binary Target Improvements, but I was unable to find any example for that proposal.

All of my build files contains absolute paths, so I guess a simple package of the folder will not work.

Providing only the prebuild dlls at "SwiftGodot\.build\x86_64-unknown-windows-msvc\debug\SwiftGodot.dll still triggers a full rebuild.

[migueldeicaza]

Thanks for opening this issue!

[kelteseth]

I'm no longer able to compile SwiftGodot with Swift 6. It either stops doing anything while trying to link SwiftGodotMacroLibrary-tool.exe or it straight up crashes my pc (16 core 5950x with 32gb of Ram) when doing a full rebuild. I have never experienced a single crash before with my pc. I guess this has something to do with:

In Swift 6, the Swift package manager also parallelizes builds across multiple cores on Windows by default.

[kelteseth]

swiftlang/swift-package-manager#7992

[migueldeicaza]

Question, are you doing "Release" builds of SwiftGodot?

There is a known problem in the Swift ecosystem around the dependency on SwiftSyntax, which is both large, but also when compiled in Release mode takes forever to build. I just experienced that. In my case the difference is between 15 seconds and about 4 minutes.

Because it is trying to do Whole Module Optimizations

[migueldeicaza]

It is tragic that Swift does not have a story for pre-built binaries on Windows and Linux.