Adds ability to create files/folders in subfolder using DynamicForm. Closes #1901#1903

joelfmrodrigues merged 1 commit intopnp:devpnp/sp-dev-fx-controls-react:devfrom

martinlingstuyl:dynamicform-subfoldersmartinlingstuyl/sp-dev-fx-controls-react:dynamicform-subfoldersCopy head branch name to clipboard