Support for multi-database connections

[dacou-rca]

Is your feature request related to a problem? Please describe.
I have a PostgreSQL connection containing multiple Postgres databases. I did not find a solution to show all the databases I have access to in SQLTools.

Describe the solution you'd like
Add an options to "Show all databases"

Describe alternatives you've considered
Right now I think I need to duplicate my connection for each database.

Additional context
N/A

[Multiply]

Multiple databases, and schemas would be amazing. Currently autocomplete doesn't work for things such as SELECT * FROM <db>.<schema>.<table>.