Fixed some UI bugs and paginating for Spark

dbrepo-data-service/Dockerfile

...rvice/src/main/java/at/tuwien/endpoints/RestEndpoint.java

...va/at/tuwien/gateway/impl/MetadataServiceGatewayImpl.java

...ervices/src/main/java/at/tuwien/mapper/MariaDbMapper.java

...s/src/main/java/at/tuwien/service/impl/DataConnector.java

.../java/at/tuwien/service/impl/TableServiceMariaDbImpl.java

dbrepo-metadata-service/Dockerfile

dbrepo-ui/components/subset/Results.vue

dbrepo-ui/components/subset/SubsetToolbar.vue

dbrepo-ui/composables/table-service.ts

dbrepo-ui/nuxt.config.ts

.../pages/database/[database_id]/subset/[subset_id]/data.vue

...ui/pages/database/[database_id]/table/[table_id]/data.vue

dbrepo-ui/stores/cache.js