feat(scripts): Add Q CLI installation script

Add comprehensive installation script for Q CLI that:
- Detects platform (macOS/Linux) and architecture
- Downloads appropriate package from release CDN
- Verifies checksums and GPG signatures
- Handles both glibc and musl Linux variants
- Provides interactive installation with progress feedback
- Includes cleanup of temporary files

🤖 Assisted by Amazon Q Developer

Author: kkashilk