Display datatable for datasets with results => DONE

...multiple/components/result/datasets-result.component.html

...h-multiple/components/result/datasets-result.component.ts

src/app/search-multiple/containers/datasets.component.ts

...search-multiple/containers/result-multiple.component.html

...p/search-multiple/containers/result-multiple.component.ts

src/app/search-multiple/store/search-multiple.action.ts

src/app/search-multiple/store/search-multiple.effects.ts

src/app/search-multiple/store/search-multiple.reducer.ts

src/app/search-multiple/store/search-multiple.selector.ts

src/app/search-multiple/store/search-multiple.service.ts

src/app/shared/datatable/datatable.component.html

src/app/shared/datatable/datatable.component.ts