Add ontology support

[ajtritt]

Originally reported by: Andrew Tritt (Bitbucket: ajtritt, GitHub: ajtritt)

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Spec objects should support adding ontology and ontology id

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• Bitbucket: https://bitbucket.org/lblneuro/pynwb/issue/15

[oruebel]

Related issues:

• NWB Schema: Add ontology support nwb-schema#1
• PyNWB issue with discussion from previous hackathon: Implementing a flexible ControlledVocabulary extension to label NWB data #513
• Related use case: Provide a field for orcID nwb-schema#477

A solution for this is currently being developed in HDMF:

• https://hdmf.readthedocs.io/en/stable/tutorials/External_Resources.html#sphx-glr-tutorials-external-resources-py

[bendichter]

@rly , @oruebel I'm thinking about creating a tutorial in PyNWB to illustrate best practices in using ndx-external-resources. What do you think?

[rly]

There are still questions about whether the HERD data is integrated within the NWB file or outside the NWB file before upload to DANDI though. Otherwise, HERD is pretty much done. See https://hdmf.readthedocs.io/en/stable/tutorials/plot_external_resources.html .

A tutorial in PyNWB would be a good idea. @mavaylon1 is working on #1781