Support dictionary data type

[SoftStoneDevelop]

For Postgres: hstore/IDictionary<string, string> and also hstore[]/IDictionary<string, string>[]

For Clickhouse: all check types of Key/Value. Check all combination is insane so we check only whereKey type == Value type.
IDictionary<int, int>, IDictionary<long, long> and so on.

[SoftStoneDevelop]

The current implementation has a discrepancy with the database capabilities and type. Please note that tests should only check for unique Maps in the database.

See ClickHouse/clickhouse-cs#319