Add support for Pig datetimes

There's currenly no support for conversion to/from Pig datetimes

**Reporter**: [Christian Rolf](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=ccrolf) / @ccrolf
#### Related issues:
- [Sample NanoTime class serializes and deserializes Timestamp incorrectly](https://github.com/apache/parquet-java/issues/1606) (relates to)
#### Original Issue Attachments:
- [parquet_datetime_support.patch](https://issues.apache.org/jira/secure/attachment/12682623/parquet_datetime_support.patch)
- [PARQUET-137.1.patch](https://issues.apache.org/jira/secure/attachment/12834637/PARQUET-137.1.patch)

_{**Note**: *This issue was originally created as [PARQUET-137](https://issues.apache.org/jira/browse/PARQUET-137). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}