Support to set ClickHouse query settings when reading table

[zhouyifan279]

We can add settings to ClickHouse SQL when using ClickHouse client. For example:

SELECT * FROM replacing_merge_tree_table SETTINGS final=1;

Currently, there is not way to achieve this in clickhouse-connector.

Maybe clickhouse-connector can read settings starting with spark.clickhouse.settings. and apply them when read/write clickhouse tables.