Function calling plus minor fixes

What's Changed

• Added function calling, currently supported just by Open AI and Gemini (and, frankly, Gemini's support has problems)
• Introduce llm-capabilities, which indicates which non-standard functionality each provider supports.
• Fixed issue of logging when we weren't supposed to.
• Change to use Ollama chat endpoint by @tquartus in #16
• Fix emacs 28 incompatibility llm-fake by @s-kostyaev in #21
• Add CI by @s-kostyaev in #24
• Fix ollama mentioned instead of llama.cpp by @SmallAndSoft in #25

New Contributors

• @tquartus made their first contribution in #16
• @s-kostyaev made their first contribution in #21
• @SmallAndSoft made their first contribution in #25

Full Changelog: 0.9.1...0.10.0