Local Model support

[orual]

Refactor the GenAiClient to be more configurable and support local models via e.g. Ollama

[espeon]

isn't ollama already supported with genai?

[orual]

sorta but the current genai model provider in pattern doesn't handle it at all really

[orual]

some of the tool stuff i mentioned in discord is also important for local models bc so many of them are scuffed at tool use and an LLM HAS to be able to use tools to work as a backing model for a pattern entity