Fixes and Performance Enhancements for LowCardinality Data Type in ClickHouse

Fixes and performance improvements for the LowCardinality data type. GROUP BY using LowCardinality(Nullable(...)). Getting the values of extremes. Processing high-order functions. LEFT ARRAY JOIN. Distributed GROUP BY. Functions that return Array. Execution of ORDER BY. Writing to Distributed tables (nicelulu). Backward compatibility for INSERT queries from old clients that implement the Native protocol. Support for LowCardinality for JOIN. Improved performance when working in a single stream. #3823 #3803 #3799 #3769 #3744 #3681 #3651 #3649 #3641 #3632 #3568 #3523 #3518