Adding pragma option for parquet binary as string

[pdet]

Binary columns are read from parquet files as strings by default:

PRAGMA enable_parquet_binary_as_string

To disable it:

PRAGMA disable_parquet_binary_as_string

If the binary_as_string parameter from the Parquet Function is used, that is used indiferent of the value set in the pragma

PRAGMA enable_parquet_binary_as_string

-- This will read binaries as binaries
SELECT * FROM parquet_scan('data/parquet-testing/binary_string.parquet',binary_as_string=False)

[Mytherin]

Thanks! Looks good.