warn / error when promise wrapper functions are used with callback

Looks like it's a common mistake, we should warn ( or maybe throw an error when promisified api method is used with a call back )

https://teratail.com/questions/118317

  const job = async () => {
    const conn = await pool.getConnection();

    await conn.query('SELECT * FROM hoge_1', (err, rows, fields) => {
      if (err) throw err;
      console.log(rows);
    });

    await conn.query('SELECT * FROM hoge_2', (err, rows, fields) => {
      conn.release();
      if (err) throw err;
      console.log(rows);
    });
  };

  await job();
  await pool.end();

Start by locating the promise wrapper used by conn.query and the callback-handling path shown in the example. Check how pool.getConnection and the promise API distinguish callback usage, then add coverage for the selected warning or error behavior and verify the example no longer passes silently.