Add Llama 70B 3.3 to fireworks (#654)

# What does this PR do?

- Makes Llama 70B 3.3 available for fireworks

## Test Plan

```shell
pip install -e . \
&& llama stack build --config distributions/fireworks/build.yaml --image-type conda \
&& llama stack run distributions/fireworks/run.yaml \
  --port 5000
```

```python
        response = client.inference.chat_completion(
            model_id="Llama3.3-70B-Instruct",
            messages=[
                {"role": "user", "content": "hello world"},
            ],
        )
```

## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [x] Ran pre-commit to handle lint / formatting issues.
- [x] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

llama_stack/templates/fireworks/run.yaml

@@ -110,6 +110,11 @@ models:
   provider_id: fireworks
   provider_model_id: fireworks/llama-v3p2-90b-vision-instruct
   model_type: llm
+- metadata: {}
+  model_id: meta-llama/Llama-3.3-70B-Instruct
+  provider_id: fireworks
+  provider_model_id: fireworks/llama-v3p3-70b-instruct
+  model_type: llm
 - metadata: {}
   model_id: meta-llama/Llama-Guard-3-8B
   provider_id: fireworks