datastreams: affiliations: add EDMO organizations

[ptamarit]

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Fixes #433

Description

The pull requests provides a new datastream to import affiliations from the European Directory of Marine Organisations (EDMO).
There is no official mapping between EDMO and ROR, so for now we are importing them separately with a different main ID scheme.

There is no downloadable RDF file containing all the data, so we need to call a SPARQL endpoint in order to import the data.

The data can be imported with the following command:

$ invenio vocabularies import --vocabulary affiliations:edmo --origin https://edmo.seadatanet.org/sparql/sparql
EDMOOrganizationTransformer: ["No alpha_2 country found for: {'org': {'type': 'uri', 'value': 'https://edmo.seadatanet.org/report/1051'}, 'name': {'type': 'literal', 'value': 'UNKNOWN'}, 'countryName': {'type': 'literal', 'value': 'Unknown'}, 'locality': {'type': 'literal', 'value': 'UNKNOWN'}, 'deprecated': {'type': 'literal', 'datatype': 'http://www.w3.org/2001/XMLSchema#boolean', 'value': 'false'}}"]
Vocabulary affiliations:edmo imported. Total items 5656. 
5655 items succeeded
1 contained errors
0 were filtered.

Affiliations organizations autocomplete showing ROR and EDMO organizations side by side:

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[ptamarit]

Here I took the decision of importing all organizations (the 5038 active ones and the 617 deprecated ones) and to the deprecated ones as inactive, but we could also filter out deprecated organizations by adding the following to the query:

FILTER (!?deprecated)

[ptamarit]

Here I took the decision of storing the whole URL (e.g. "https://edmo.seadatanet.org/report/42") as the identifier.
Other options could be to store something like "edmo:42".

[ptamarit]

• Fix saving of records with EDMO affiliations.

Saving a record with an EDMO affiliations is failing with Creators: No valid scheme recognized for identifier: