Add Fireworks llm model provider to support

[yaoice]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

Fireworks AI delivers a fast, affordable, and customizable platform for developers to run and fine-tune generative artificial intelligence (AI) models at scale.

2. Additional context or comments

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3. Can you help us with this feature?

• I am interested in contributing to this feature.