Collections API

[samredai]

Summary

This enables creating collections via the API and adding one or more nodes to them. A collection has a unique name and a description for now but we can expand it to capture more metadata later. Nodes are added to collections via a relationship table and a node can be added to multiple collections. Deleting a collection does not delete any of the nodes in it.

Test Plan

• [x] PR has an associated issue: #1059
• [x] make check passes
• [x] make test shows 100% unit test coverage

Deployment Plan

[netlify[bot]]

✅ Deploy Preview for thriving-cassata-78ae72 canceled.

Name	Link
🔨 Latest commit	ff5779ab94cf1db721ddfcca3b499bd2566a0ac0
🔍 Latest deploy log	https://app.netlify.com/sites/thriving-cassata-78ae72/deploys/667e289c469f5f0008dcfbba

[samredai]

@shangyian @agorajek this is ready for review