packages/core - y.js in contracts

[rjwebb]

This PR adds support for the y.js Doc CRDT to Canvas.

The document update currently has to be computed outside of the action call.

To do:

• Add a new "yjs-doc" column type to the model schema, models that have this column type can only have an id and content column, the content column stores a serialized Y.js document
• Add a applyDocumentUpdate method which applies a Y.js update to a given document
• Create a test that shows that document updates converge on concurrent peers
• Remove the operations table?
• The updates look a lot like continuations, could we make the API even simpler here?
• Remove yjs from GossipLog, feels like we are leaking an abstraction here

Tests

• Create a table with a yjs-doc column
• Call one YJS method and assert that the operation has been added and the state has been updated
• Call multiple YJS methods and assert that the operations have been added and the state has been updated
• Sync two peers that have changes applied to YJS text tables and assert that the changes have been merged

How has this been tested?

• CI tests pass
• Tested with example-chat (including login, all signers, and exchanging messages)
• Tested with @canvas-js/test-network: (optional)

Does this contain any breaking changes to external interfaces?

• Contract interfaces
• Core interface
• CLI
• Data storage formats, including IndexedDB, SQLite, or filesystem storage (will this break existing apps?)