This implements basic multi-select for adding components to a problem bank, for the Libraries Relaunch Beta [FC-0062]. Part of: https://github.com/openedx/frontend-app-authoring/issues/1385
This implements basic multi-select for adding components to a problem bank, for the Libraries Relaunch Beta [FC-0062]. Part of: https://github.com/openedx/frontend-app-authoring/issues/1385