Automate updating author list in `CITATION.cff`

[matt-graham]

As we have contributor information recorded in machine readable format in both .all-contributorsrc and CITATION.cff it would be nice if we could automatically update latter based on the former? Main problems I can see are:

• That it would be difficult to get affiliations automatically (short of doing something like checking if GitHub user is part of UCL organization?)
• I'm not sure its currently possible to get ORCID for a user using GitHub REST API if they have it linked to their profile.
• GitHub profile only lists name as one field, not separated in to given and family name components.

[paddyroddy]

This sounds like it could be a useful tool beyond python-tooling