mol-model: added sourceIndex to AtomicHierarchy

package-lock.json

src/mol-model-formats/structure/mmcif/atomic.ts

src/mol-model-formats/structure/mmcif/ihm.ts

src/mol-model-formats/structure/mmcif/parser.ts

src/mol-model-formats/structure/mmcif/sort.ts

src/mol-model/structure/model/properties/atomic/hierarchy.ts