[Feature] RDS add support to schema & use IF NOT EXISTS

[lillo42]

Is your feature request related to a problem? Please describe.
Today the RDS outbox provides a way to create the table via OutboxBuilder, but it doesn't support schema also, we could add a new method to create a query to create a table if it doesn't exist

[iancooper]

Yes, creating inboxes and Outboxes, if you don't have them, is something we have discussed. The samples actually have code to do that, using FluentMigrator. A FluentMigrator approach has advantages, as it also provides the ability to upgrade our Outboxes if needed. The Aspire PR was also going to look at the ability to put this into a library but not sure how far @holytshirt got, if anywhere

[iancooper]

@lillo42 Is this fixed?