Epic: Duckdb projection expression pushdown

[myrrc]

We want to push down scalar (and, in the future, aggregate) functions that are part of SELECT into vortex.
Example: SELECT strlen(col) doesn't need to decompress the strings.

Subtasks:

• Scalar functions pushdown Scalar functions pushdown to Duckdb #8303
• Cast pushdown (upstream) Push down type casts to file readers duckdb/duckdb#22788
• Migrate cast pushdown to Vortex Cast pushdown for duckdb #8620
• Upstream scalar functions pushdown
• Aggregate function pushdown https://github.com/vortex-data/vortex/tree/myrrc/temp-agg-fn-pushdown
• Propagate statistics from arrays in scans

Future work:

• Push down chains of functions f_1(...(f_n(col)) if leaf child is BoundColumnRef.
• Push down multiple expressions for column if we can push all of them i.e. allow pushing down (strlen(col), col). This requires a change on projection ids passed to vortex. In this example we need to pass projection_ids=[0, 0].

[myrrc]

This change regressed vortex-compact significantly on the same query. We can't solve this issue now as ZSTD stores lengths with data, so you need to decompress. Implementing a kernel for byte_length which only used decompressed length without constructing a VarBinView didn't yield any performance improvements. We'll accept the regression as there's no way for reader to distinguish vortex vs. vortex-compact