Add parametric storage backend selection to AWS deployment scripts

[ehsaniara]

Summary

• Add parametric storage backend selection to AWS deployment scripts
• pre-setup.sh now accepts --storage flag to configure IAM permissions for the selected backend (cloudwatch, s3, local)
• ec2-user-data.sh now accepts command-line arguments (--storage, --s3-bucket, etc.) for cleaner User Data scripts
• S3 IAM permissions are automatically configured when using --storage=s3

Changes

scripts/aws/pre-setup.sh

• Add --storage=TYPE parameter (cloudwatch, s3, local)
• Add --s3-bucket=NAME parameter with interactive prompt if not provided
• IAM policy dynamically includes storage-specific permissions
• S3 permissions scoped to the specified bucket

scripts/ec2-user-data.sh

• Add command-line argument parsing (--storage, --s3-bucket, --s3-prefix, --s3-class, --version, --port)
• Add --help flag with usage documentation
• Backward compatible with environment variables