Feat: exposing `duckdb_prepared_statement_type`

Hello there!

So, I'm wondering if there are any plans to expose `duckdb_prepared_statement_type` which is exposed in C API?

https://duckdb.org/docs/api/c/prepared#duckdb_prepared_statement_type

It's similar to what's done in `better-sqlite3` with the [reader](https://github.com/WiseLibs/better-sqlite3/blob/60763a0742690c8bae1db43d838f418cfc83b656/docs/api.md#properties-1) property, which indicates whether a statement would return data or not.

We have a case where we need to decide whether we execute a prepared statement with `.run` or `.all`, and having something like `duckdb_prepared_statement_type` or `reader` would be super helpful!