Enable create_ontology to upsert

[thair116]

Description

For my project, I have created a large number of Ontologies using the labelbox python client. I'd like to be able to make small changes to the Ontologies in-place, without having to create new Ontologies and then connect them to the projects.

A simple change to create_ontology to take an optional ontology id and thus enable it to upsert was the easiest way to do this. Is this something we could get merged in? If so I can flesh this out more and add tests.

Fixes # (issue)

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