add flag to install and load httpfs

[cldellow]

so, eg, this query will work:

select count(*), count(distinct vendorid)
from read_parquet('https://d37ci6vzurychx.cloudfront.net/trip-data/yellow_tripdata_2022-01.parquet')
limit 1

Currently if you try this query, you'll get:

IO Error: No files found that match the pattern "https://d37ci6vzurychx.cloudfront.net/trip-data/yellow_tripdata_2022-01.parquet"

This should be opt in, though - the ability to make outbound connections is probably a surprising one.