GH-4472 Fixed an issue in the mergeToolUseEvents method of StreamHelper
#4474
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As mentioned in the issue, the current implementation of the
mergeToolUseEventsmethod inStreamHelperlacks robustness and does not properly handle cases wherepreviousEventis not of typeToolUseAggregationEvent. This PR addresses that issue.All the changes introduced by this PR:
mergeToolUseEventsmethod inStreamHelperto skip merging whenpreviousEventis not aToolUseAggregationEvent.StreamHelperTeststo improve test coverage.eventToChatCompletionResponsemethod inStreamHelperdid not handle thethinkingBlock.signature()property. This PR also fixes that issue.Fixes #4472