ROENROLL-1918 show spinner while audit in progress

src/app/dars/dars-audit-view/dars-audit-view.component.ts

src/app/dars/dars-view/dars-view.component.html

src/app/dars/dars-view/dars-view.component.ts

src/app/dars/metadata-table/metadata-table.component.html

src/app/dars/metadata-table/metadata-table.component.scss

src/app/dars/metadata-table/metadata-table.component.ts

src/app/dars/models/audit-metadata.ts

src/app/dars/services/api.service.ts

src/app/dars/store/actions.ts

src/app/dars/store/effects.ts

src/app/dars/store/reducer.ts

src/app/dars/store/selectors.ts

src/app/dars/store/state.ts

src/app/dars/store/utils.ts