Support DuckDb Schema

[plaflamme]

Currently, the extension assumes everything lives in the main schema and will list all relations in a flat list. But duckdb supports schema, so ideally, tables and views would be listed under the schema they belong to (e.g.: like the snowflake sql-tools extension shows here)

[RandomFractals]

@plaflamme extended DuckDB schema tree view display will be added to the DuckDB Pro Tools in the next release of that Pro Tools extension.

We already have it on the list of enhancements for the extended version of this extension for our Pro sponsors on github:

[RandomFractals]

Here is quick preview of the upcoming #DuckDBPro Tools v1.1.0 with extended DB objects tree view display showing DuckDB instance databases, schemas, tables, views, installed and loaded DuckDB extensions, DB types, functions, and keywords:

[RandomFractals]

Extended version of DuckDB information schema, sqlite and pg_catalog views and results display we'll be releasing to our DuckDB Pro Tools users soon: