[Feature Request] get all new ids when batch insert

## Background
I use egg-mysql.
insert into table (column1, column2) values(value1, value2), (value3, value4), (value5, value6);

I want to get insertId of all new inserted columns from the result. But I can't only get the id of the first row.

## Proposal
Can I get ids of every new row?
Like this:
const result = this.app.mysql.query('insert into photo (user_id, name) values(?, ?), (?, ?), (?, ?)', ['xxx', 'xxx', 'xxx', 'xxx', 'xxx', 'xxx']);
const [id1, id2, id3] = result.insertIds;

Or provide an efficient way to insert in batches.