(cli): Add experimental Windows platform support

[903174293]

Add Windows/Cygwin/MINGW64 support to generated Makefiles

Fix Kubebuilder to work correctly on Windows environments (CMD, PowerShell,
Cygwin, and Git Bash/MINGW64) by improving the generated Makefile to handle
path format differences.

Problem:

• Cygwin/MINGW64 make provides Unix-style paths (/cygdrive/d/... or /d/...)
• Windows Go tools require Windows-style paths (D:/...)
• Setting GOBIN with Unix paths caused "go install" to fail
• Binary execution failed due to path format mismatches

Solution:

• Detect environment (Windows/Cygwin/MINGW64/Linux/macOS)
• Convert paths between Unix and Windows formats as needed
• Use Windows paths for GOBIN (Go tools)
• Use Unix paths for shell execution (in Cygwin/MINGW64)
• Handle .exe extensions on Windows
• Use module paths instead of ./... for better compatibility

Changes:

• Modified: pkg/plugins/golang/v4/scaffolds/internal/templates/makefile.go
• Added path conversion functions (convert-to-windows-path, convert-to-mingw-path)
• Added environment detection (UNAME_S, IS_MINGW, IS_CYGWIN)
• Added dual path variables (LOCALBIN_FOR_GO, LOCALBIN_FOR_SHELL)
• Updated tool binary paths to use correct format per platform
• Improved go-install-tool function to handle all environments

Testing:

• Tested on Windows CMD, PowerShell, Cygwin, Git Bash (MINGW64), and Linux
• All environments pass: kubebuilder init && kubebuilder create api
• Verified generated files: bin/controller-gen.exe, api/v1/zz_generated.deepcopy.go
• No breaking changes to Linux/macOS behavior

Backward Compatibility:

• No breaking changes
• Existing projects continue to work
• Graceful degradation if tools unavailable
• No API changes

Fixes: #[issue-number]

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: 903174293 / name: 位面之子 (af40d68)

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[903174293]

在windows os上执行创建文件件，进入到文件夹下，执行如下命令即可验证：
git init
go mod init hihonor.com/kubebuilder/app
kubebuilder init --domain hihonor.com
kubebuilder create api --group kubebuilder --version v1 --kind App

[vitorfloriano]

Hi @903174293 thanks for opening the PR. I'm afraid native Windows support is not currently on the roadmap for Kubebuilder. The motivation behind not pursuing Windows support can be read in here, here and here

Nonetheless, if you still think native support is better than the WSL2 + Docker combo we recommend, or if there are any limitations/shortcomings to that, please let us know and we can further discuss this patch.