[fix](parquet) fix dict page offset zero incompatible behaviour #41506
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Proposed changes
Reason: https://issues.apache.org/jira/browse/ARROW-5322
Java readers(parquet-mr) handles "dictionaryPageOffset = 0" to determine if dictionary page exists where as the C readers uses "has_dictionaryPageOffset" (_isset bit in thrift message) to determine the same resulting in incompatible behaviours.
Therefore, we should consider that dicttionary page exists when both
__isset.dictionary_page_offsetis true anddictionary_page_offsetis greater than 0.