Add support for standard events INITIATE_STREAM and COMPLETE_STREAM
Add support for standard events INITIATE_STREAM and COMPLETE_STREAM

BranchMetrics/Smart-App-Banner-Deep-Linking-Web-SDK,BranchMetrics/Smart-App-Banner-Deep-Linking-Web-SDK,BranchMetrics/Smart-App-Banner-Deep-Linking-Web-SDK,BranchMetrics/Smart-App-Banner-Deep-Linking-Web-SDK