More Providers!

Added Huggingface, Ollama, generic helpers, generic Completions and Responses

What's Changed

• chore: add mistralrs provider for local models by @EggerMarc in #38
• chore(core): add parts macro by @EggerMarc in #39
• feat: add responses provider by @EggerMarc in #40

Full Changelog: 0.2.0...0.3.1