Implement ArcGIS Adaptor

[christad92]

ArcGIS is the world's most used geospatial analytics platform. Humanitarian organizations like WHO, UNICEF, CRS, and others use ArcGIS for analysing GIS Data and creating maps for field operations.

A typical workflow here is Kobotoolbox/CommCare -> DB -> ArcGIS or Kobotoolbox/CommCare -> ArcGIS. Sometimes, they want to upsert the data into an existing feature set.

Authentication here will be OAuth.

Documentation: https://doc.arcgis.com/en/