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.*}

Inizia dal codice di caricamento degli stream di parquet-hadoop ed esamina H2SeekableInputStream e H1SeekableInputStream, usando come contesto la issue correlata HadoopStreams.wrap. Verifica come vengono attualmente caricati gli stream Hadoop 2.0.2+; il lavoro è completato quando il binding H2 non ha più bisogno della reflection, mentre H1 rimane disponibile per gli stream senza ByteBufferReadable.

Scritto dal modello di indicizzazione a partire dal testo della issue.