Support pulling models, and manage ollama server by PID

Main changes:

• can now pull models
• can see info about existing models, ollama client version, currently set model, etc
• StartServer now checks if an ollama process is running yet, and if not, starts the ollama serve process.
  • in general, we no longer directly manage a exec.Cmd instance. Instead, we return the PID.
  • StopServer was removed; this can now be done by killing the ollama process PID, if you want.

Support json schema responses

v1.1.0

Release v1.1.0: Added support for structured JSON schema responses

v1.0.0

v1.0.0 includes the basic functionality of generating completions, streaming responses, etc. nothing too fancy, and serves all basic purposes. This package is used for my personal AI tools I create, so as I come up with new abstractions or other ways to facilitate this, they will be incorporated in future releases/updates.