drill

1c5decc1 - DRILL-2143: Part 2 - fix interpreter and add QueryDateTimeInfo injectable to fill in holes from removing RecordBatch from UDFs - Move list of accepted injectable types into the UdfUtilities interface for easier maintenance.

DRILL-2143: Part 2 - fix interpreter and add QueryDateTimeInfo injectable to fill in holes from removing RecordBatch from UDFs - Move list of accepted injectable types into the UdfUtilities interface for easier maintenance. Fix one more new function to remove RecordBatch from setup method. Add back UdfUtilities interface to FragmentContext lost in rebasing. Remove unneeded testcase in TestExampleQueries, remove commented out code in InterpreterGenerator previously used to handle DrillBuf injectables, now being handled by reflection to set the DrillBuf rather than the previously generated code that would use the direct reference to the incoming RecordBatch to get a buffer. Fix docs on UdfUtilities and package docs for drill/exec/expr, belongs with 2143 part 2 patch. Fix belongs with 2143, change interpreter to output a ValueHolder instead of a ValueVector in the case of a constant expression. 2143 update - Use reflection to remove boilerplate for adding new injectable types for UDFs.