Make DELTA_LENGTH_BYTE_ARRAY default encoding for binary values

### Describe the enhancement requested

The current default for V1 pages is PLAIN encoding. This encoding mixes string length with string data. This is inefficient for for skipping N values, as the encoding does not allow random access. It's also slow to decode as the interleaving of lengths with data does not allow efficient batched implementations and forces most implementations to make copies of the data to fit the usual representation of separate offsets and data for strings.

DELTA_LENGTH_BYTE_ARRAY has none of the above problems as it separates offsets and data. The parquet-format spec also seems to recommend this
https://github.com/apache/parquet-format/blob/c70281359087dfaee8bd43bed9748675f4aabe11/Encodings.md?plain=1#L299
```
### Delta-length byte array: (DELTA_LENGTH_BYTE_ARRAY = 6)

Supported Types: BYTE_ARRAY

This encoding is always preferred over PLAIN for byte array columns.
```

V2 pages use DELTA_BYTE_ARRAY as the default encoding, this is an improvement over PLAIN but adds complexity which makes it slower to decode than DELTA_LENGTH_BYTE_ARRAY with the potential benefit of lower storage requirements.

JMH benchmarks in Trino's parquet reader at `io.trino.parquet.reader.BenchmarkBinaryColumnReader` showed that DELTA_LENGTH_BYTE_ARRAY can be decoded at over 5X speed and DELTA_BYTE_ARRAY at over 2X the speed of decoding PLAIN encoding.
Given the above recommendation of parquet-format spec and significant performance difference, the reference implementation here should be updated to use DELTA_LENGTH_BYTE_ARRAY by default.

### Component(s)

Core

L’issue ne nomme aucun fichier source ni aucun test. Commencez par localiser la sélection de l’encodage par défaut de V1 et V2 dans l’implémentation Core de parquet-java, puis examinez les tests d’encodage existants. Le travail est terminé lorsque les colonnes BYTE_ARRAY utilisent DELTA_LENGTH_BYTE_ARRAY par défaut, tandis que le reste du comportement d’encodage reste inchangé.

Rédigé par le modèle d'indexation à partir du texte de l'issue.