Clickhouse CREATE TABLE .... Engine = MergeTree() should be supported

[SylphiaWindy]

https://clickhouse.com/docs/engines/table-engines/mergetree-family/mergetree#table_engine-mergetree-creating-a-table

Both syntax should be supported:

1. CREATE TABLE ... Engine = MergeTree ...
2. CREATE TABLE ... Engine = MergeTree() ...