Sample of usage Parquet-1396 and Parquet-1178 for column level encryption with pluggable key access

This Jira provides a sample to use Parquet-1396 and Parquet-1178 column level encryption with pluggable key access. The Spark SQL application shows how to configure Parquet-1396 to encrypt and columns. The project CryptoMetadataRetriever shows how to implement the interface defined in Parquet-1396 as an example. 

The project to be uploaded soon. 

**Reporter**: [Xinli Shang](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=shangx@uber.com) / @shangxinli
#### Related issues:
- [EncryptionPropertiesFactory and DecryptionPropertiesFactory](https://github.com/apache/parquet-java/issues/2220) (Blocked)
- [Passing Field Metadata to Parquet](https://issues.apache.org/jira/browse/SPARK-25858) (Blocked)
- [Parquet modular encryption](https://github.com/apache/parquet-java/issues/2110) (depends upon)
#### Externally tracked issue: [https://github.com/apache/parquet-java/issues/2220](https://github.com/apache/parquet-java/issues/2220)

_{**Note**: *This issue was originally created as [PARQUET-1397](https://issues.apache.org/jira/browse/PARQUET-1397). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Inizia leggendo Parquet-1396 e Parquet-1178, quindi esamina le issue correlate bloccate 2220 e SPARK-25858 e la issue dipendente 2110. La issue indica che un’applicazione Spark SQL e un progetto CryptoMetadataRetriever devono dimostrare la configurazione della crittografia e l’implementazione dell’interfaccia, ma il progetto non è ancora allegato. Il lavoro è completo quando il progetto di esempio è stato caricato e documenta entrambi i percorsi di utilizzo.

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