`CREATE DATABASE` location

#451 implemented support for `CREATE DATABASE` queries.
It includes two tests for the query.

`Statement::CreateDatabase` has two additional fields: `location` and `managed_location`. The syntax for these is not detailed; neither in the PR, nor anywhere else I can find.

1. Perhaps this could be detailed in the docs
2. Perhaps tests could be added for these fields
3. What is the syntax for these fields?

Comece revisando o PR #451 e os dois testes existentes de CREATE DATABASE; em seguida, inspecione Statement::CreateDatabase, incluindo seus campos location e managed_location. Estabeleça a sintaxe para ambos os campos e documente-a adicionando testes que cubram a sintaxe, para que o comportamento fique claro.

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