parquet-cascading Add Parquet Avro Scheme

At the moment using parquet-cascading writing Parquet files when using Avro as the object format is not possible as a Schema is not yet provided.

As part of this ticket, a ParquetAvroScheme will be introduced, and also a local.ParquetAvroScheme , so that from Cascading / Scalding developers can read / write and test in both --hdfs and --local mode Parquet-Avro files.

**Reporter**: [Antonios Chalkiopoulos](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=antwnis) / @Antwnis
**Assignee**: [Antonios Chalkiopoulos](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=antwnis) / @Antwnis

_{**Note**: *This issue was originally created as [PARQUET-198](https://issues.apache.org/jira/browse/PARQUET-198). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Beginne damit, die Scheme-Implementierungen von parquet-cascading und die entsprechenden lokalen Schemes zu finden, und ermittle anschließend, wie Cascading und Scalding mit Avro-Objektformaten umgehen. Füge die angeforderten ParquetAvroScheme und local.ParquetAvroScheme hinzu, einschließlich der Abdeckung des Lesens, Schreibens und Testens von Parquet-Avro-Dateien in HDFS- und lokalen Modi.

Vom Indexierungsmodell aus dem Issue-Text verfasst.