Spike/get concepts associated with a document from vespa

[katybaulch]

Description

Add new endpoint to get concepts associated with a document from vespa.

Proposed version

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Type of change

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How Has This Been Tested?

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Reviewer Checklist

• DB_CLIENT DEPENDENCY IS ON THE LATEST VERSION
• The PR represents a single feature (small driveby fixes are also ok)
• The PR includes tests that are sufficient for the level of risk
• The code is sufficiently commented, particularly in hard-to-understand areas
• Any required documentation updates have been made
• Any TODOs added are captured in future tickets
• No FIXMEs remain

[jamesgorrie]

This would then allow us to use this endpoint on the document page in the frontend.

[jamesgorrie]

Loving all the 🐝 vespa love

[katybaulch]

We're currently getting all the concepts associated with all the documents in a family, but not all of those concepts will appear on all of the documents.

I want to see whether this gives me what i need to filter concepts on a specific document