Suggestion/Request: Configuration management

[ndebard]

I think we need some sort of configuration management like a .ursa_config.rc in $HOME or passed on command line options or etc. Content would include things like the URL of your LLM, default amount of tokens before summarization is invoked, default kwargs for LLM (e.g. reasoning=high, one might want), etc. Right now I do some of these in the YAML conf for the specific plan/execute from YAML approach, but it's obviously hidden off there in that way of using URSA.