Automate Scale Testing

We currently run the following scale tests manually, but, should be automated using the DML automation we've already implemented.

[Test 1](https://gist.github.com/onderkalaci/4078596676611a963328d1a37243ad77#file-test1-sql): Simple schema, different data types, different index types, default values
[Test 2](https://gist.github.com/onderkalaci/4078596676611a963328d1a37243ad77#file-test2-sql): 100 columns, 50 indexes, many jsonb fields, many unique constraints
[Test 3](https://gist.github.com/onderkalaci/4078596676611a963328d1a37243ad77#file-test3-sql): Tables with foreign keys among them
[Test 4](https://gist.github.com/onderkalaci/4078596676611a963328d1a37243ad77#file-test4-sql): Reference Tables

We might also consider adding new tests, expanding the tests or merging some of the tests.