v0.0.3

Added

• Add --output-format={hex,base64} to control the measurement output format (default is hex)
• For SEV-ES and SNP: Add guest CPU type choice using --vcpu-type or --vcpu-sig or --vcpu-family/--vcpu-model/--vcpu-stepping
• Add SEV (--mode=sev) and SEV-ES (--mode=seves) measurement modes
• Add --verbose for verbose output; by default, only the digest is printed
• Improve README