refactor(TeacherProjectService): move createGroup() and createNode()#1919

hirokiterashima wants to merge 1 commit intodevelopWISE-Community/WISE-Client:developfrom

refactor-TeacherProjectService-move-functions-to-create-steps-and-lessonsWISE-Community/WISE-Client:refactor-TeacherProjectService-move-functions-to-create-steps-and-lessonsCopy head branch name to clipboard