Add support for Ollama (via openai compatible APIs)

[raff]

Use -cm ollama to select the default model (llama3) or -cm ollama:{model} to select a differnt model.
Ollama should be running locally on the default port http://localhost:11434

[baalimago]

Looks good, and many thanks for the addition! One request though: could you please update the README.md with an entry similar to the other vendors? I think a link that gives a brief start to get started with ollama plus the requirement of default ollama port.

Also, I don't have a beefy enough computer to run any models supplied via ollama, but I trust you've verified functionality yourself

[raff]

Sure, I'll update the readme. And yes, I did verified myself (chat and query commands)

[baalimago]

This also needs to get updated: /baalimago/clai/blob/main/internal/text/querier_setup.go#L20 in order to support the config system for the different models. Right now, I suspect the configuration file for any ollama model will overwrite each others at <os-config-dir>/.clai/VENDOR_NOT_FOUND.json.

I think <os-config-dir>/.clai/ollama_ollama_{model} would be an appropriate format, with {model} being just ollama for the default case.

You can verify the problem+solution by checking out <os-config-dir>/.clai/ (probably ~/.config/.clai) or running clai setup -> 1 (model files) -> c (configure) and seeing ollama_ollama_... config files (and the lack thereof, until change)

EDIT: I think I'll refactor this so that this is inside the respective vendors, but I'll do so aftter this PR to make it less confusing