Add a TerminationReason for ContextWindowExceededError

[LamaAlQarni]

Please add a TerminationReason for ContextWindowExceededError. You might not have trajectories that are long, but when the model is looping/overly chatting/thinking. The run will end up being long and exceeds 16K-32K context length.

[DongyunZou]

Same issue