Adjust DOI information so that it can be integrated with Metax/Etsin

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Description

As part of the integration with #292 we would need to register DOIs for study and dataset

• whenever new study or datasets are created we will register each as draft in Datacite
• when we publish the folder we will publish the study and datasets in Datacite

We will need to add keywords to the datacite.json schema to be able to have keywords present for #292

A folder with the new changes will look like:

{
    "folderId": "folderid",
    "name": "mock folder",
    "description": "test mock folder",
    "published": "true",
    "metadataObjects": [
        {
            "accessionId": "EDAG3991701442770179",
            "schema": "study"
        },
        {
            "accessionId": "EGA123456",
            "schema": "sample"
        }
    ],
    "extraInfo": {
        "studyIdentifier": {
            "accessionId": "acccessionId",
            "identifier": {
                "identifierType": "DOI",
                "doi": "https://doi.url"
            },
            "url": "https://etsin.url",
            "types": {
                "resourceTypeGeneral": "Collection"
            }
        },
        "datasetIdentifiers": [
            {
                "accessionId": "acccessionId1",
                "identifier": {
                    "identifierType": "DOI",
                    "doi": "https://doi.url"
                },
                "url": "https://etsin.url",
                "types": {
                    "ris": "DATA",
                    "bibtex": "misc",
                    "citeproc": "dataset",
                    "schemaOrg": "Dataset",
                    "resourceTypeGeneral": "Collection"
                }
            },
            {   
                "accessionId": "acccessionId2",
                "identifier": {
                    "identifierType": "DOI",
                    "doi": "https://doi.url"
                },
                "url": "https://etsin.url",
                "types": {
                    "ris": "DATA",
                    "bibtex": "misc",
                    "citeproc": "dataset",
                    "schemaOrg": "Dataset",
                    "resourceTypeGeneral": "Collection"
                }
            }
        ],
        "publicationYear": 2020,
        "publisher": "CSC"
    },
    "drafts": []
}

DoD (Definition of Done)

• make necessary changes to datacite.json to add keywords
• make changes to folders extraInfo to allow multiple dois
• make changes to publication so it matches
• link study and datasets in datacite
• publish to datacite study and datasets, not only as draft but as registered and finable DOIs

Testing

unit and integration testing

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will be continued in #367