[FEATURE] Support binding classes on Pydantic Models to CocoIndex Struct #795
Description
Pydantic is widely used in Python to describe schema. Currently we support dataclass and NamedTuple for structs. We want to add support for Pydantic Models, i.e. users can bind CocoIndex Struct to a Pydantic model.
This will unlock extra benefits later, e.g. Pydantic supports field-level descriptions (which Python docstring doesn't support) - it's very helpful in describing the schema and pass to LLM. To leverage this, we'll need to add extra field on related structs on the engine side (Rust). So we'll create separate issues for these additional features. The current feature request focus on basic support on Pydantic models, and cover existing properties in existing CocoIndex data types.
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