Add cross-platform support for yq binary download

[Till0196]

This PR adds cross-platform support for downloading the yq binary in the Makefile,
replacing the hardcoded Linux AMD64 version.

Changes

• Add dynamic OS and architecture detection using uname commands
• Replace hardcoded yq_linux_amd64 download with parameterized yq_$(OS)_$(ARCH)
• Update tar extraction and file moving to use dynamic filenames (added mv command for BSD tar compatibility)
• Support macOS (darwin), Linux, and multiple architectures (AMD64, ARM64)

Benefits

• Enables development on macOS and ARM-based systems
• Removes platform-specific hardcoding
• Improves developer experience across different environments

[chez-shanpu]

LGTM