Added System Tables: formats, data_type_families, aggregate_function_combinators, table_functions, table_engines, collations

Why it matters

These system tables allow users and administrators to easily query and explore available data formats, data type categories, aggregate function combinators, table functions, table engines, and collations within ClickHouse. This improves the transparency of internal components and helps in writing more informed queries and managing database configurations.

How to use it

Users can query these new system tables directly using SELECT statements, for example:

SELECT  FROM system.formats;
SELECT  FROM system.table_engines;

These tables are accessible without any additional configuration, providing immediate insight into the respective categories.