Remove redundant data transfer timeout property

[kaifeur]

dataTransferTimeout property was only used to set max_execution_time as a sum of socket_timeout and dataTransferTimeout. From 6851fd7 behavior changed: max_execution_time is set as max_execution_time, has nothing to do with socket or data transfer timeouts.

(and also there are some misleading old docs about it)

[github-actions]

Benchmark                           (client)  (connection)  (statement)   Mode  Cnt     Score     Error  Units
Basic.insertOneRandomNumber  clickhouse-jdbc         reuse       normal  thrpt   20   226.359 ±  45.440  ops/s
Basic.insertOneRandomNumber  clickhouse-jdbc         reuse     prepared  thrpt   20   223.088 ±  28.855  ops/s
Basic.insertOneRandomNumber  clickhouse-jdbc           new       normal  thrpt   20   223.884 ±  36.218  ops/s
Basic.insertOneRandomNumber  clickhouse-jdbc           new     prepared  thrpt   20   253.696 ±  31.697  ops/s
Basic.selectOneRandomNumber  clickhouse-jdbc         reuse       normal  thrpt   20  1221.593 ± 171.877  ops/s
Basic.selectOneRandomNumber  clickhouse-jdbc         reuse     prepared  thrpt   20  1263.176 ± 181.028  ops/s
Basic.selectOneRandomNumber  clickhouse-jdbc           new       normal  thrpt   20  1278.258 ± 166.768  ops/s
Basic.selectOneRandomNumber  clickhouse-jdbc           new     prepared  thrpt   20  1063.829 ± 175.259  ops/s