fix(ImageIOWorker): Wrap the returned errors in a Promise
fix(ImageIOWorker): Wrap the returned errors in a Promise

This improves how the error is handled downstream and improves the message.

InsightSoftwareConsortium/ITKBridgeJavaScript,InsightSoftwareConsortium/ITKBridgeJavaScript,thewtex/ITKBridgeJavaScript,InsightSoftwareConsortium/ITKBridgeJavaScript,thewtex/ITKBridgeJavaScript,thewtex/ITKBridgeJavaScript