[Feature] Support S3 Files

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• https://aws.amazon.com/jp/blogs/aws/launching-s3-files-making-s3-buckets-accessible-as-file-systems/
• https://docs.aws.amazon.com/ja_jp/AmazonS3/latest/userguide/s3-files-file-systems-deleting.html
• https://docs.aws.amazon.com/ja_jp/AmazonS3/latest/userguide/s3-files-resources.html
• https://aws.amazon.com/jp/about-aws/whats-new/2026/04/amazon-s3-files/
• https://dev.classmethod.jp/articles/s3-files-nfs-mount-aws-s3/
• https://dev.classmethod.jp/articles/amazon-s3-files-ga-mount-and-compare-efs/

CFn: https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-s3files-filesystem.html

CDK: aws/aws-cdk#37547

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