Add in support for vectorized parquet reads on data files with row position (_pos) in the metadata column

[kbendick]

Updating parameterized tests to have names in this PR https://github.com/apache/iceberg/pull/1539, I noticed that TestSparkParquetReadMetadataColumns had a vectorized parameter that is currently only tested with false. It is commented out for true and fails for all three of the tests as reading parquet files that have row position (_pos) in the metadata column using the vectorized reader has not been implemented yet.

[kbendick]

If this is implemented, the parameter group for vectorized should be updated to include true here: https://github.com/apache/iceberg/blob/44c1d00b37f0d7fc2e978baad4f7a861a8335cf0/spark/src/test/java/org/apache/iceberg/spark/data/TestSparkParquetReadMetadataColumns.java#L109

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