Update type smallserial for increment

[baolequoc]

Summary

• Added SMALLSERIAL type when using increments in settings to export postgress sql

Issue

(issue link here)

Lasting Changes (Technical)

• Updated function getFieldLines to add type for increment
• Added smallserial_type.in.dbml and smallserial_type.out.sql in test/export/postgresql to test for smallserial type

Checklist

Please check directly on the box once each of these are done

• [ ] Documentation (if necessary)
• [x] Tests (integration test/unit test)
• [ ] Integration Tests Passed
• [ ] Code Review