feat: Enable Windows Support for `rules_uv`

[albertocavalcante]

Currently, the rule set fails on Windows.

I was able to partially workaround this by wrapping the pip_compile into sh_binary. This resolves the issue of executing the shell script; however, another issue is the path, as ../ is not where rules_multitol is located. It's ../../external/rules_multitool.

That certainly has to do with runfiles / rlocation.

I will add more details as I investigate this further.

Gazelle currently uses shell scripts as well and supports Windows.

Reference for inspiration on possible fixes and enhancements on the implementation: https://github.com/bazel-contrib/bazel-gazelle/blob/0990b28954080252c89369d7a27176aee7381ab5/def.bzl

Step 1 is most likely to wrap all shell executables into a sh_binary rule.

While creating a venv, the same runfiles issue occurs, but it also currently expects to source $target/bin/activate, whereas on Windows, it must be $target/Scripts/activate.

[jonasteuwen]

I would support such a feature! We use bazel to build our project https://github.com/NKI-AI/fastslide.git, and while cross-compile works, ideally we'd want to use a windows runner in github actions too so we can run the smoke tests. Is help needed?