QR code / PDF reports for LOIs

FR first created for Ground platform: https://github.com/google/ground-platform/issues/2242

@aurelgrooves is currently demoing in Cameroon and stakeholders there strongly suggest the need of something shareable at the end of each LOI collection that leads to an overview of data collected and can connect to e.g. Whisp Earthmap.
That overview should be easily shareable with surveyed individuals, e.g. by QR code and by that typical share function on all Android phones where you can copy the link, send through Whatsapp, send by eMail, etc...
Eventually, that should include GeoIDs.