Union type for all streaming events.
XAIResponsesStreamEvent: XAIResponsesStreamEventCreated | XAIResponsesStreamEventInProgress | XAIResponsesStreamEventCompleted | XAIResponsesStreamEventFailed | XAIResponsesStreamEventIncomplete | XAIResponsesStreamEventOutputItemAdded | XAIResponsesStreamEventOutputItemDone | XAIResponsesStreamEventContentPartAdded | XAIResponsesStreamEventContentPartDone | XAIResponsesStreamEventTextDelta | XAIResponsesStreamEventTextDone | XAIResponsesStreamEventFunctionCallArgumentsDelta | XAIResponsesStreamEventFunctionCallArgumentsDone | XAIResponsesStreamEventReasoningSummaryTextDelta | XAIResponsesStreamEventReasoningSummaryTextDone | XAIResponsesStreamEventError