Check if an S3 bucket exists
Note
internally uses head_bucket
Examples
if (FALSE) { # aws_has_creds()
bucket1 <- random_bucket()
aws_bucket_create(bucket1)
# exists
aws_bucket_exists(bucket = bucket1)
# does not exist
aws_bucket_exists(bucket = "no-bucket")
# cleanup
six_bucket_delete(bucket1, force = TRUE)
}