Provide official prebuilt MS-Windows binaries for jank

[ikappaki]

(Continuing the discussion on prebuild windows binaries for jank from #716)

It would be great to have official prebuilt win binaries for jank so windows users don’t need to build jank from source themselves.

There’s already some initial work in https://github.com/ikappaki/jank-win-release for building and packaging jank and LLVM for MSYS2/pacman, which could serve as a starting point.

From the discussion so far, the rough direction seems to be:

• Long term: upstream an official package to the MSYS2 packages repo once jank has stable releases.
• Short term: provide prebuilt binaries through jank-managed infrastructure so Windows users can install jank without a full local toolchain build.
• Potentially integrate with AUR/pacman workflows so users can stay within their package manager instead of downloading binaries manually.

The main goal here is to make the windows setup experience much simpler while the llvm/windows support work continues to stabilize.

[phreed]

I could include a Windows package as a conda-forge package conda-forge/staged-recipes#33514 if the MSYS2/CLANG64 requirement were exchanged for a Clang-cl requirement https://prefix.dev/channels/conda-forge/packages/clang_win-64.
This would mean all the bash scripts would need to be replaced with something more cross-platform (like nushell, or python).

[phreed]

A big reason to use Jank is that it can act as a glue language to other libraries.
Most Windows libraries are MSVC ABI, which (I believe) are not compatible with MinGW-w64 ABI.
The clang_win-64 package I mentioned is expressly ABI compatible with MSVC.
ABI compatibility is a (the) main goal of conda-forge.