BIT_PACKING is written by default when Definition or Repetition levels are empty

As discussed in https://github.com/apache/arrow/discussions/47113 , this package is writing the deprecated BIT_PACKING encoding to the column metadata and the DataPageHeader. This is only seems to happens when rep/def levels are empty. I think this is where it's happening:

```java
public class DevNullValuesWriter extends ValuesWriter {
....
public Encoding getEncoding() {
return BIT_PACKED;
}
}
```

Wouldn't it make sense to just return RLE?

I've seen this in parquet-java 1.15.1 and Overture Maps files using 1.13.1.

Comienza localizando DevNullValuesWriter e inspeccionando su implementación de getEncoding(); después, sigue cómo ese valor llega a los metadatos de columna y a DataPageHeader. Confirma que los niveles de repetición y definición vacíos ya no producen la codificación BIT_PACKED obsoleta, sino que usan RLE.

Escrito por el modelo de indexación a partir del texto del issue.