Add partition column option to JDBC handler

Currently JdbcStorageHandler does not split input in Tez. The reason is numSplit of JdbcInputFormat.getSplits can only pass via "mapreduce.job.maps" in Tez. And "mapreduce.job.maps" is not a valid param if authorizer(eg. SQLStdAuth) is in use. User ends up always use 1 split.

We need to rely on this new feature if we want to support multi-splits. Here is my proposal:
1. Specify partitionColumn/numPartitions, and optional lowerBound/upperBound in tblproperties if user want to split jdbc data source. In case lowerBound/upperBound is not specified, JdbcStorageHandler will run max/min query to get this in planner. We can currently limit partitionColumn to only numeric/date/timestamp column for simplicity
2. If partitionColumn/numPartitions are not specified, don't split input
3. Splits are equal intervals without respect to data distribution
4. There is also a "hive.sql.query.split" flag vetos the split (can be set manually or automatically by calcite)
5. If partitionColumn is not defined, but numPartitions is defined, use original limit/offset logic (however, don't rely on numSplit).