DRILL-4291: Fix Missing classes when trying to query varchar using JDBC - Create a new simplified version of the Hadoop Text class that doesn't include massive dependencies. - Update Vectors to use new Text class. - Update the jdbc-all module to have a test which also includes complex types. - Clean up exclusions in Jdbc jar file to reduce file size. - Add an enforcer rule that ensures the adbc-all jar exclusions are maintained in the future.