Add support for foreign server and user mapping

[bilby91]

Hello,

We are using the provider very extensively in my organization and we are looking into managing foreign servers and user mappings.

Foreign Server: https://www.postgresql.org/docs/current/sql-createserver.html User Mapping: https://www.postgresql.org/docs/current/sql-createusermapping.html

I'm looking into potentially implementing it based on availability. Would this be something that the maintainers would like to support?

Thanks in advance for the hard work on this project!

[fabio-paiva-sp]

Anyone working on this? It would be really nice to have this feature available