Remove unused httpfs duckdb extension
it's not used for files download anymore, we use `huggingface_hub` directly

**+ I added some logging to check what's going on with the stats computing in this PR to make it fast, to be removed!**
Remove unused httpfs duckdb extension: it's not used for files download anymore, we use `huggingface_hub` directly

**+ I added some logging to check what's going on with the stats computing in this PR to make it fast, to be removed!**