General query executor

[jsmith]

Closes #66
Closes #70

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[jsmith]

Let me know what you think about this! It's definitely not ready as I still have work to do to make it look better. As the deployed version doesn't actually work due to the backend issue, you'll have to run this branch locally. Here is how to test the feature:

1. Open up the application
2. Paste "MATCH (n:ProvenanceNode) WHERE n.id = "A366615769" RETURN n" into the "Cypher Query..." box
3. Click "Query"
4. The query will be executed in the backend and a single node will be displayed (ie. A366615769)

Side note, I think the backend issue must be related to the DB (we currently use GrapheneDB as our production database); however, the logs tell us nothing 😞 Eventually, I can try to debug the backend <-> database communication to find the error! Let me know if this is ever a priority as I don't think it should take me too long.

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