fix(sdk): max_tokens are now optional from the backend (#153)

Author: nirga

packages/traceloop-sdk/traceloop/sdk/prompts/model.py

@@ -24,7 +24,7 @@ class ModelConfig(RegistryObjectBaseModel):
     mode: str
     model: str
     temperature: float
-    max_tokens: int
+    max_tokens: Optional[int]
     top_p: float
     stop: List[str]
     frequency_penalty: float