Improve DuckDB Store

[cfahlgren1]

This will enable us to make schema changes and track more things like #41 and also not break existing DuckDB databases when upgrading observers.

• Track OpenAI Arguments (top_p, temperature, etc)

[davidberenstein1957]

@cfahlgren1 is this ready to be reviewed?

[cfahlgren1]

@cfahlgren1 is this ready to be reviewed?

Should be very close, will do another pass. I noticed messages wasn't being stored in DuckDB for some reason. But should be fixed here. Will do another pass in the next day or two.

Couple small changes:

• Use DuckDB Store by default (if no store is provided)
• Updated openai example to just use gpt-4o (reduces a few requirements to text the initial example: 1. getting hf fine grained token, etc)
• We can run migrations, so it should be backwards compatible with older
• We store arguments like stream, temperature, etc in arguments field.