GH-2962: Set dictionary_page_offset even when encoding_stats are missing #3012
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Rationale for this change
Currently dictionary page offset is not being set when there are no encoding statistics. This is creating problem while creating parquet files using the addRowGroup method in ParquetMetadataConverter
What changes are included in this PR?
Set dictionary_page_offset value when column has any dictionary pages.
Are these changes tested?
Yes
Are there any user-facing changes?
No
Closes #2962