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DuckDB Vortex Metadata #10078

Description

@xevix

Problem or motivation

The duckdb-vortex extension seems not to have metadata functions exposing information about the FastLanes encoding, similar to what's exposed in the vx CLI. In my case, I'm working on a columnar file viewer (currently supporting Parquet and Vortex) powered by DuckDB, and wanted to expose more metadata via DuckDB's Vortex extension. https://github.com/xevix/duckparq

Proposed solution

In DuckDB, Parquet has several metadata functions exposing the internal metadata of files, such as parquet_metadata and parquet_schema. https://duckdb.org/docs/lts/data/parquet/metadata

It would be useful to have similar functions for vortex for understanding the metadata better.

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