[FIX]:oceanbase plugin setFetchSize restore default

[xxsc0529]

[desc]
This is because in order to improve synchronization efficiency, the higher version of oceanbase-client has enabled the preprocessing statement behavior for oracle, and the driver will adopt Oracle's preprocessing method. And the processing of large fields (such as CLOB, BLOB). The driver will send data in pieces, which is suitable for processing large data volumes. This mechanism conflicts with setFetchSize. The current datax defaults to setOracle mode fetchSize to Integer.MIN_VALUE, and configure extendOracleResultSetClass in jdbcUrl. =true resolves this conflict.
After testing, it is recommended to use jdbcUrl configuration to solve it.