Add `affiliation` to `contact` and `contributor`

[briri]

This PR adds an affiliation to the contact and contributor elements for issue #26.

For example:

"contact": {
  "name": "John Smith",
  "mbox": "john.smith@tuwien.ac.at",
  "contact_id": {
    "identifier": "https://www.tiss.tuwien.ac.at/person/2351952424",
    "type": "other"
  },
  "affiliation": {
    "name": "Reasearch Data Alliance",
    "affiliation_id": {
      "identifier": "https://ror.org/05dc6w374",
      "type": "ror"
    }
  }
}

I did not include an update to ontologies section. I don't have much experience with OWL nor the bandwidth at this point to modify it to include the affiliation.

I'm not sure if there is a defined process for generating new versions of the schema (from the Github) standpoint. I added a new v1.2 here in this PR, but am happy to change it to v1.1 or submit this PR to a new branch if it makes sense to set one up to stage changes prior to their official release.

[jomtov]

As stated at the RDA20 session on maDMPs in Gothenburg 2023-03-21, we from Stockholm University and other Swedish universities strongly support this PR, as there is a administrative bibliometric / scientometric need for affiliation data in order to track and monitor the entire research output, including DMPs, of an institution.

[korbinib]

This extension would also allow better usage of maDMPs for creation of projects in RDM systems, application for storage quotas, ...

[TomMiksa]

Hi,

thanks for this comment.

@MarekSuchanek, @peterneish : we should include this in the next release

[borsna]

funder_id.type needs to have ror added