add key property to intra- and inter-bonds

CHANGELOG.md

src/mol-model-formats/structure/property/bonds/chem_comp.ts

src/mol-model/structure/query/context.ts

src/mol-model/structure/query/queries/filters.ts

src/mol-model/structure/query/queries/generators.ts

src/mol-model/structure/query/queries/modifiers.ts

src/mol-model/structure/structure/unit/bonds/data.ts

...mol-model/structure/structure/unit/bonds/inter-compute.ts

...mol-model/structure/structure/unit/bonds/intra-compute.ts

src/mol-script/language/symbol-table/structure-query.ts

src/mol-script/runtime/query/table.ts