Add arg to delete files after migrating them to S3
On migrate-attachments command, provide the wp search-replace command for convenience
Move all intermediate sizes to S3 too
Added convenience command to create an AWS IAM user for S3 Uploads to use
Added a generate-iam-policy command incase the user wants to manually create an IAM user and attach the policy
Support paths in S3_UPLOADS_BUCKET to mutliple sites can use the same S3 Bucket