Allowing relative paths

Hi!,
I use duckdb-wasm and it works well when I read a parquet file with a complete URL. But if I want to use relative file paths, it doesn't work. Probably because this extension checks whether the filepath in read_parquet('./data.parquet') starts with "http". Is there a workaround?

Start by reproducing read_parquet('./data.parquet') in duckdb-wasm and compare it with a complete URL. Trace how the extension handles the filepath check for relative paths. Done means relative parquet paths work in duckdb-wasm without breaking complete URLs.

Written by the indexing model from the issue text.