Presto Parquet writer writes timestamp in 96 bits width

[yingsu00]

According to https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#timestamp, INT96 has been deprecated and Parquet Timestamp logical type is now annotated with INT64. But the Parquet writer writes INT96 according to internal report.
See facebookincubator/velox#4680 (comment)

We need to

1. verify if the parquet writer version was set up correctly
2. verify if it really writes 96 bits values
3. If verified, then it needs to be updated to INT64

[nmahadevuni]

By default, optimized writer is disabled, it uses RecordFileWriter which uses int96 for Timestamp
message hive_schema {
optional int96 t;
}
When the optimized writer is enabled, the new writer uses int64 for Timestamp.
message presto_schema {
optional int64 t;
}

[nmahadevuni]

Session config is <catalog>.parquet_optimized_writer_enabled and the catalog property is hive.parquet.optimized-writer.enabled