enabled streaming query export

src/components/DBOverview.vue

src/components/ExportView.vue

src/components/MapView.vue

src/components/helpers/HelpButton.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