[SPARK-4798][SQL] A new set of Parquet testing API and test suites

This PR provides a set Parquet testing API (see trait `ParquetTest`) that enables developers to write more concise test cases. A new set of Parquet test suites built upon this API  are added and aim to replace the old `ParquetQuerySuite`. To avoid potential merge conflicts, old testing code are not removed yet. The following classes can be safely removed after most Parquet related PRs are handled:

- `ParquetQuerySuite`
- `ParquetTestData`

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Used in `ParquetTest.withSparkConf`.