Add ORCID as a new field in the account creation form

[philippconzett]

There are several open issues about ORCID support in Dataverse, e.g. #4236 . As a first step, I'd like to suggest to add a new field in the account creation form, thus the form used when creating a Dataverse account by filling in a user name, name, email address etc. In the suggested new field, users can add their ORCID (in Dataverse installations where ORCID log-in is enabled, users could of course also use that option; see #4236 , but this issue is simply about adding an ORCID field in the account creation form). The ORCID information added in this way should be available when a user creates a new dataset: The ORCID field in the author section of the Citation Metadata field should be pre-filled with the ORCID of the user depositing the dataset.