Add early support for nested types (like struct and list<struct>)

[trueleo]

Summary

This PR introduces early support for nested types, such as Struct and List, similar to those found in DataFusion. The primary goal is to explore and validate an approach for encoding these complex types.

Changes

• Refactored encode_value to support recursion, enabling encoding of arbitrary nested types.
• Initial handling logic for Struct and List types (not fully tested yet).

Note

I couldn't find any official information about what client's are suppose to accept. Struct binary encoding is based on the logic found here

[trueleo]

@sunng87 Current integration test is not good enough to make sure this feature works. Do you have any ideas on how we can improve tests for this ?

Specifically testing for binary/text encoding and other features like information schema