better typing for ajaxGet

src/examples/proteopedia-wrapper/helpers.ts

src/examples/proteopedia-wrapper/index.ts

src/mol-model-props/pdbe/structure-quality-report.ts

src/mol-model-props/rcsb/assembly-symmetry.ts

src/mol-plugin/behavior/dynamic/volume.ts

src/mol-plugin/context.ts

src/mol-plugin/state/transforms/data.ts

src/mol-util/data-source.ts

src/mol-util/graphql-client.ts