Create database

[AlexZeitler]

As discussed on Twitter a while ago, I need to create (and drop) MSSQL and Postgres databases in integration test scenarios.

As discussed, I would like to contribute this to Weasel.

From what I've learned so far, we would need a Database class which implements the ISchemaObject interface, so we can follow the usage patterns already existing (using the Migrator).

Aside the topics discussed on Twitter already, are there any existing ideas/concepts regarding database creation using Weasel I should know of?