Parquet dataset

[ChrisJohnNOAA]

Description

Adds support to use parquet files in an table dataset (EDDTableFromParquetFiles). Also adds support for exporting to parquet file format.

Fixes # (issue)

#196

Type of change

Please delete options that are not relevant.

• [ X ] New feature (non-breaking change which adds functionality)
• [ X ] This change requires a documentation update

Checklist before requesting a review

• [ X ] I have performed a self-review of my code
• [ X ] My code follows the style guidelines of this project
• [ X ] I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings -- There are some new runtime warnings due to overlap in dependencies that the various Parquet dependencies pull in. I've tried to minimize this.
• [ X ] I have added tests that prove my fix is effective or that my feature works
• [ X ] New and existing unit tests pass locally with my changes