Support inner arrays

Why it matters

The feature enables the nested function to work with arrays inside arrays, allowing more complex nested data structures to be processed and queried efficiently. This improves ClickHouse's functionality when dealing with deeply nested array data, enhancing flexibility for users working with complex schemas.

How to use it

Users can now pass inner arrays as arguments to the nested function as they would with simple arrays. No additional configuration is required; simply use nested with data containing inner arrays to leverage this support.