[Roadmap] Add support for LLM provider - Fireworks AI

[Hury999]

Why
Users will be able to leverage Fireworks AI's language models within big-AGI, expanding the range of AI capabilities.

Description
Integrate Fireworks AI as a new language model provider option in big-AGI, allowing users to select and use Fireworks AI models.

Requirements
[] API Integration: Develop connectors to interface with Fireworks AI's API
[] User Interface: Add Fireworks AI as a selectable option in the LLM provider dropdown menu

[enricoros]

Does Fireworks AI provide a models list API? If not, there's nothing we can do, because we'd have to spend time continuously updating the models list. Please let me know if they have such API.