Support remote development/dev container

[OneCyrus]

it would be great if the extension would fully support remote development. e.g. the file browser always shows the local filesystem instead of the remote one when selecting the duckdb file.

[archiewood]

I think if you type a relative remote path into the file picker field, it should work? (Don't click the button, just type)

(Is it just a UI issue, or does it need an underlying fix also)