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MINOR: [PARQUET] Clean up Skip method naming rows->values (#13997)

The Skip method is skipping values and not rows. "values" is used throughout the code interchangeably with levels. Repeated fields may have multiple values, thus the use of "rows" is not accurate because we are not skipping over the values from the repeated field to the next row.

Similarly, two other variables total_num_rows_ and seen_num_rows_ actually refer to values and not rows. So I updated them as well.

I will add more tests for the Skip method that will clarify this behavior for repeated fields in a separate change.

Authored-by: Fatemah Panahi <panahi@google.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>