Function insert_step_instance 

pub async fn insert_step_instance<'a, E>(
    executor: E,
    id: StepInstanceId,
    run_id: RunId,
    step_name: &str,
    step_type: &str,
    status: StepStatus,
    created_at: DateTime<Utc>,
) -> Result<PgQueryResult, Error>
where
    E: Executor<'a, Database = Postgres>,

Insert step instance.