`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?

Commencez par examiner la PR #451 et les deux tests CREATE DATABASE existants, puis inspectez Statement::CreateDatabase, notamment ses champs location et managed_location. Établissez la syntaxe des deux champs et documentez-la en ajoutant des tests qui couvrent cette syntaxe afin que le comportement soit clair.

Rédigé par le modèle d'indexation à partir du texte de l'issue.