feat: add provider data keys for Cerebras, Databricks, NVIDIA, and RunPod

- added missing tests for Fireworks, Anthropic, Gemini, SambaNova, and vLLM

llama_stack/providers/remote/inference/runpod/config.py

@@ -6,12 +6,19 @@
 
 from typing import Any
 
-from pydantic import Field
+from pydantic import BaseModel, Field
 
 from llama_stack.providers.utils.inference.model_registry import RemoteInferenceProviderConfig
 from llama_stack.schema_utils import json_schema_type
 
 
+class RunpodProviderDataValidator(BaseModel):
+    runpod_api_token: str | None = Field(
+        default=None,
+        description="API token for RunPod models",
+    )
+
+
 @json_schema_type
 class RunpodImplConfig(RemoteInferenceProviderConfig):
     url: str | None = Field(