[SPARK-13989] [SQL] Remove non-vectorized/unsafe-row parquet record reader

## What changes were proposed in this pull request?

This PR cleans up the new parquet record reader with the following changes:

1. Removes the non-vectorized parquet reader code from `UnsafeRowParquetRecordReader`.
2. Removes the non-vectorized column reader code from `ColumnReader`.
3. Renames `UnsafeRowParquetRecordReader` to `VectorizedParquetRecordReader` and `ColumnReader` to `VectorizedColumnReader`
4. Deprecate `PARQUET_UNSAFE_ROW_RECORD_READER_ENABLED`

## How was this patch tested?

Refactoring only; Existing tests should reveal any problems.

Author: Sameer Agarwal <sameer@databricks.com>

Closes #11799 from sameeragarwal/vectorized-parquet.