dxp/issues#805 loadmore widget

Changes

• Use useInfiniteQuery instead of useQuery for fetching the data
• Add "load more" widget

Test

• First merge this and this merge requests
• Build the app and use it in DXP
• Update the search config and use "Loadmore" for the pager
• Make sure it works as expected
• Try other types of pagers and make sure they're not broken