Ability to show all schemas in the DB instead of just `public`

[thenonameguy]

https://github.com/supabase-community/postgres-new/blob/f1dcb5c72b834e8ec9a74e1b875c1762f109bcba/apps/postgres-new/components/ide.tsx#L160

I'm using database.build to showcase my data migration tooling, which creates it's own DB objects in the schemamap schema. For clarity, it would be great if the SchemaGraph viewer would (optionally?) allow visualizing certain/all schemas.

[gregnr]

Great suggestion. This would probably be a good use case for @fsansalvadore's multi-select 😄