title: Returning ID of inserted query in TypeORM and MySQL
body: <p>I,m new to TypeORM and I have problem that I'm trying to solve.
  I'm wondering how to retrieve ID after INSERT query. 
  I have column @PrimaryGeneratedColumn() with id number in my entity and my code looks similar to this:</p>
  
  <pre><code>await getConnection()
      .createQueryBuilder()
      .insert()
      .into(Test)
      .values([
          { firstName: "test", lastName: "test" }
       ])
      .execute();
  </code></pre>
  
  <p>What I want to archieve is to return ID of inserted row after executing this function.</p>
  
  <p>EDIT: I'm using MySQL.</p>
  
  <p>Is that possible?</p>
  
  <p>Thanks.</p>