Document support for delegationUID client side ODBC/JDBC property in open source JDBC driver

There is no documentation around the "delegationUID' property in the open source documentation. We at MapR ask our customers to use this property as one form of impersonation. Because sqlline ships with the open source JDBC driver, if users want to use delegationUID from sqlline because they use it from ODBC/JDBC/ BI tools, they should be able to but there's no documentation on drill.apache.org on how to do so. There is documentation on ODBC driver but not on JDBC.