Add optional ORCID provenance column

[cthoyt]

Closes #30

This PR does the following:

• Add the ability to add an optional ORCID column (labeled "contributor") to each curated TSV
• Adds two example ORCID annotations
• Updates the output to incorporate ORCID provenance in SSSOM and ontology output
• Update data integrity tests (will do this if the PR gets positive feedback and the questions below are answered)

It has the minor drawback of creating a big diff, but it's mostly localized to generated artifacts.

Questions before merging this, if everyone thinks it's a good idea:

1. Should we enforce that the contributor column is always present, even if it's mostly empty?
2. Should we curate a list of ORCID->Name mappings to make these outputs (namely, the ontology) nicer to read in Protege? It's also possible to quickly interact with the ORCID REST API to look up names as an alternative.

[egonw]

I am not convinced this simple provenance model will be final (it's very limited), but let's give it a try.

Can you fix the error?

E               AssertionError: Lists differ: ['#did', 'when', 'nextofkin'] != ['#did', 'when', 'nextofkin', 'contributor']
E               
E               Second list contains 1 additional elements.
E               First extra element 3:
E               'contributor'
E               
E               - ['#did', 'when', 'nextofkin']
E               + ['#did', 'when', 'nextofkin', 'contributor']
E               ?                             +++++++++++++++

[cthoyt]

@egonw done

[egonw]

Thanks, @cthoyt