Harvester / Add support for Zenodo and Pangaea

Zenodo is an "Open repository for EU-funded research outputs from Horizon Europe, Euratom and earlier Framework Programmes.".
PANGAEA is a data publisher. "Our services are open for archiving, publishing, and distributing georeferenced data from earth system research."

Add import from both provider by adding a conversion to ISO19115-3.

Sample input:
* from Zenodo https://zenodo.org/records/6343858, https://zenodo.org/records/6343858/export/json
* from Pangaea https://doi.pangaea.de/10.1594/PANGAEA.820426, https://ws.pangaea.de/oai/provider?verb=GetRecord&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.820342&metadataPrefix=pan_md

Conversions can be used to import or harvest records using the simple URL harvester.

Funded by Ifremer