Impose structure on agent generation

[svange]

Description

Agents come in 3 flavors: completion agents, chat agents, and function agents (that currently only use the openai chat-gpt 0613 model).

This seems like a candidate for some sort of class composition (or... maybe... inheritance).

Possible Solution

Python protocols can go a long way, but at first glance it seems like a compositional structure works here. A GptAgent can be a class with attributes such as agent_config, llm, and toolbox.

Inheritance is also an option, but I prefer to explore more idiomatic ways to do this.

Additional context

Currently, the GptAgent class has a bunch of if/else conditionals in its init method. Time for a refactor, as these options will likely only grow as we adopt other types of agents like gorilla, or self-hosted, etc.

Additional context

No response