Function create_storage_backend 

pub async fn create_storage_backend(
    tx: &mut Transaction<'_, Postgres>,
    id: BackendId,
    name: &str,
    description: &Option<String>,
    backend_type: &BackendType,
    config: &Value,
    aws_assume_role_arn: &Option<String>,
    is_default_sfs: bool,
) -> Result<(), Error>

Creates a new storage backend. Create storage backend.