Add a Spark bundle that packages Apache DataFusion Comet

### Problem

Hudi has no bundle that ships a native execution engine. Anyone wanting [Apache DataFusion Comet](https://datafusion.apache.org/comet/) alongside Hudi has to assemble and version-match the jars themselves. Comet publishes one artifact per Spark minor version and, at 1.0.0, covers only Spark 3.4, 3.5, 4.0 and 4.1.

### Proposal

Publish `hudi-native-spark-bundle`, the contents of `hudi-spark-bundle` plus Comet, for the Spark versions Comet actually releases for.

Scope note: Comet does not read Hudi tables natively (it rejects Hudi's file format with `Unsupported file format HoodieFileGroupReaderBasedFileFormat`), so the Parquet decode stays on Spark. What the bundle enables is native execution of the rest of the plan: joins, shuffles, sorts and aggregates over Hudi tables. Making the Hudi scan itself native is separate work.