Support for PRAGMA in duckdb

[stereosteve]

Thanks for making this project. Nice for working with duckdb.

I'm trying to use PRAGMA with the FTS extension. When trying to create a FTS index:

await sql`PRAGMA create_fts_index('users', 'id', '*')`

Results in:

error: Invalid Input Error: Cannot prepare multiple statements at once!

Seems like either need:

• A way to get the underlying connection from the pool so you can use the full API
• Or a way to run sql without going thru a prepared statement.

I think in postgres.js this would be the .simple() api