[MySQL Handler] Support upsert mutation

**Is your feature request related to a problem? Please describe.**

I want to use GraphQL Mesh and MySQL like Hasura + PostgreSQL. When I want to upsert row data, I have to exec multiple mutation or combine select query.

**Describe the solution you'd like**

In GraphQL Mesh, you use [mysql-utilities](https://github.com/tshemsedinov/node-mysql-utilities) which has sdk for upsert SQL. So I suggest how about support upsert like other mutations and queries.

**Describe alternatives you've considered**

Alternative method is multiple calls from client-side or implement self made handlers.

Start by reviewing the MySQL Handler's existing mutation behavior and the mysql-utilities upsert SDK linked in the issue. Compare the requested upsert mutation with the current MySQL handler operations, then verify that a single mutation can insert or update row data as intended.

Written by the indexing model from the issue text.