match esac consortia / institution to hoad/crossref/openapc data

[maxheld83]

The esac consortia/institution field should allow us to match the agreements and their metadata from the esac registry to our publication data from crossref.
For example, we might be able to pinpoint in a subset of the data when an agreement went into force and check whether there is any change in publication.
With the very rough cost info in the esac registry, we might even be able to offer some very tentatively link the costs to actual OA publication volume.

There might be several way to link this data:

• mapping the consortia/institution field directly to respective fields in crossref
• go via the corresponding author institution