wip, refactoring mol-model/query

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

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

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

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

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

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

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

src/mol-model/structure/query/utils/builders.ts

src/mol-task/execution/runtime-context.ts