Delta Encoding is not used when dictionary enabled

Current code doesn't enable using both Delta Encoding and Dictionary Encoding. If I instantiate ParquetWriter like this :
```Java
val writer = new ParquetWriter[Group](outFile, new GroupWriteSupport, codec, blockSize, pageSize, dictPageSize, enableDictionary = true, true, ParquetProperties.WriterVersion.PARQUET_2_0, configuration)
```

Then this piece of code :
https://github.com/apache/parquet-mr/blob/master/parquet-column/src/main/java/org/apache/parquet/column/values/factory/DefaultValuesWriterFactory.java#L78-L86

Causes that DictionaryValuesWriter is used instead of the inferred DeltaLongEncodingWriter.

The original issue is here : https://github.com/apache/parquet-mr/pull/154#issuecomment-266489768

**Reporter**: [Jakub Liska](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=l154k)

_{**Note**: *This issue was originally created as [PARQUET-796](https://issues.apache.org/jira/browse/PARQUET-796). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Commencez dans parquet-column/src/main/java/org/apache/parquet/column/values/factory/DefaultValuesWriterFactory.java aux lignes 78-86, puis retracez comment DictionaryValuesWriter est sélectionné à la place de DeltaLongEncodingWriter, déduit. Reproduisez la configuration de ParquetWriter de l’issue et ajoutez une couverture montrant le comportement d’encodage attendu lorsque le dictionary encoding est activé.

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