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Add Unicode Support in Nested Data Types

Official CH changelog text
Add support for Unicode (e.g. Chinese, Cyrillic) components in Nested data types. Close #25594. #25923 (alexey-milovidov).
Added support for Unicode characters, including Chinese and Cyrillic scripts, within Nested data types in ClickHouse.

Why it matters

This feature enables proper storage and handling of Unicode text inside Nested data structures, solving issues related to character encoding limitations and improving internationalization support for users working with diverse languages.

How to use it

Unicode support in Nested data types is now enabled by default. Users can directly store and query Unicode strings within Nested columns without additional configuration.

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