Drop Hadoop 2 input stream reflection from parquet-hadoop

Parquet uses reflection to load a hadoop2 input stream, falling back to a hadoop-1 compatible client if not found.

All hadoop 2.0.2+ releases work with H2SeekableInputStream, so the binding to H2SeekableInputStream reworked to avoid needing reflection. This would make it a lot easier to probe for/use the bytebuffer input, and line the code up for more recent hadoop releases.

H1SeekableInputStream is still needed to handle streams without ByteBufferReadable.

At some poiint support for ByteBufferPositionedReadable is needed, because that is really what parquet wants. that's where reflection will be needed

**Reporter**: [Steve Loughran](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=stevel@apache.org) / @steveloughran
#### Related issues:
- [Incorrect type checking in HadoopStreams.wrap](https://github.com/apache/parquet-java/issues/2673) (is related to)

_{**Note**: *This issue was originally created as [PARQUET-2151](https://issues.apache.org/jira/browse/PARQUET-2151). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Commencez dans le code de chargement des streams de parquet-hadoop et examinez H2SeekableInputStream et H1SeekableInputStream, en utilisant l’issue associée HadoopStreams.wrap comme contexte. Vérifiez comment les streams Hadoop 2.0.2+ sont actuellement chargés ; le travail est terminé lorsque le binding H2 n’a plus besoin de reflection, tandis que H1 reste disponible pour les streams sans ByteBufferReadable.

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