Support NestedRow type in log table (Arrow row format)

[platinumhamburg]

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• I searched in the issues and found nothing similar.

Motivation

Add NestedRow type support for log table scenarios to handle structured nested data.

Solution

• Extend Arrow row format to support NestedRow type serialization/deserialization
• Implement NestedRow type encoding/decoding in client SDK
• Add validation for NestedRow type in schema definitions
• Ensure end-to-end data flow works for NestedRow type in log tables

Anything else?

No response

Willingness to contribute

• I'm willing to submit a PR!

[XuQianJin-Stars]

hi @platinumhamburg I want take it.