Release Testing: Verify FLINK-29941 Support SQL Client connects to SQL Gateway

The issue aims to verify FLIP-275 Support SQL Client connects to SQL Gateway

Please verify:

In embedded mode: 

1. All CLI parameter still work in the embedded mode including -i, -f, --jar, --libary
2. Please submit DDL/DML to verify SQL Client can execute SQL correctly
3. Please submit a query and use CTRL+C to cancel the query to make sure SQL Client can cancel the job
4. Please submit a SQL with error to make sure the Client can display exception clearly with/without sql-client.verbose option

In  gateway mode:

      1. Please verify SQL Client can connect to the gateway with --endpoint parameter
      2. When connecting to release-1.16 Gateway, the SQL Client stop with clear exception.
      3. Leave the SQL Client alone for a long time, the SQL Client is still alive and can submit SQL.

If you meet any problems, it's welcome to ping me directly.