Support prefix/suffix/substring function pushdown to DuckDB. Fix contains() performance.

[myrrc]

We support function pushdown from #7727.
In our benchmarks, we also have prefix/starts_with and suffix/ends_with.
We should push down these functions as well. For that we need to implement Vortex's prefix/suffix/substring expressions.

Our contains() function is pushed down as %pattern% (LIKE) which has bad performance. We should have a separate expression for that as well.

[robert3005]

IIRC Arrow methods we use recognise these and replace them with contains