GH-3530: Add a custom DbDataReader for Oracle. #88

Job	Run time
SqlServer2008	9m 14s
SqlServer2008-MicrosoftDataSqlClientDriver	8m 56s
PostgreSQL	6m 51s
Firebird	11m 23s
Firebird4	11m 39s
MySQL	9m 10s
Oracle	13m 42s
SQLite	6m 40s
	1h 17m 35s

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