Add metadata to canvas

[liminal-dog]

Summary

After opening a canvas, the user can name the canvas, add a description, and associate tags.

Additional requirements

When we create a Canvas we should create a node in Neo4J representing the canvas.

The node should have the following labels and attributes. The Neo4J Ontology document is a good first stop for any ontology/schema questions.

Labels

• Chainverse
• Canvas
• Document

Attributes

• uuid
• title -- whatever the user named the document
• createdDt -
• lateUpdatedDt
• text - all of the text entered onto the document, regardless of whether or not the text appears in a block
• description - text the user added to the description of the document.

Edges
Canvas should be connected to the user who created it with an AUTHOR edge. i.e.
(x:User)-[r:AUTHOR]->(c:Canvas)