almost supporting foreign key mappings

src/components/ExportView.vue

src/components/MapView.vue

src/components/helpers/FkRelationMapper.vue

src/components/helpers/ReadinessPoller.vue

src/components/helpers/TimePointInput.vue

src/components/helpers/TimeRangeInput.vue

src/components/subcomponents/map/AttributeSelector.vue

src/components/subcomponents/map/MappingsTable.vue

src/components/subcomponents/map/RelationsColumnMapper.vue

src/components/subcomponents/transform/ExtractJson.vue

src/components/subcomponents/transform/SimpleWhere.vue

src/components/subcomponents/transform/TimeFilter.vue

src/components/subcomponents/view/DBTreeView.vue

src/components/subcomponents/view/TableDetails.vue

src/services/api-schema/openapi.d.ts

src/services/api-schema/openapi.json

src/services/api-schema/openapi.yaml

src/services/api.ts

src/services/exportStore.ts

src/services/mappingStore.ts