…sible"

This reverts commit 63eccd4.

Release note: None
Epic: None

Previously, some tests would fail due to invalid conversion
from parquet to JSON in testing. These failures showed two
underlying issues with how columns were written:
- in tests watching a column family not containing the primary
  key of the table, we would not write the primary key to
  the parquet file
- in tests where the primary key was defined with a particular
  order which is different than the table, the parquet testing
  code would not order the keys correctly

This change fixes the two above issues by (a) using the correct
iterators on `cdcevent.Row` and writing more verbose
metadata to the parquet file to use in testing.

Epic: None
Release note: None