take multiple data sources into account

this MR implements the possibility to create multiple data sources via the DASF widget. we need to add a dedicated property here to the manifest, as described in https://community.esri.com/t5/arcgis-experience-builder-questions/custom-widget-with-multiple-output-data-sources/m-p/1646327#M20637, or rather https://developers.arcgis.com/experience-builder/api-reference/jimu-core/WidgetManifestProperties/#canGenerateMultipleOutputDataSources

ping @naseem.ali: this should fix the issue with the output data sources you have. to update, cd into ArcGISExperienceBuilder/client/your-extensions/widgets/dasf-experiencebuilder-plugin and run git pull origin main