End to end encryption with schema validation

Excellent, selective-encryption and schema-support is exactly what Y.js needs to make it more applicable and efficient. Would resolve many of the open discussions we have around security, like Validation, security and middleware - #3 by stefanw.

Do you plan on continue working on this? @Himself65
This really seems like a big missing pieces before Y.js can be widely adapted as a CRDT industry standard.