feat: local cross platform build

[cydezen]

With these changes it is possible to locally cross compile the CLI by simply providing GOOS and GOARCH parameters to the make command. E.g. make build GOOS=darwin GOARCH=arm64. In this way it is possible to develop and test on different operating systems and architectures.

Additionally I added two more targets to the Makefile:

• available_platforms displays information about the available golang target platforms (os/archtiecture)
• current_platform shows the currently configured target platform

Lastly the help target was accordingly extended and refactored to provide consistent and flexible formatting.

The documentation should still be updated to reflect these changes, but any constructive feedback about the code changes is already very welcome.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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