(Node) Access Control

Problem: 

With entities, revisions and complex use-cases, the node access system needs a review. Can we:

- Expand access control beyond CRUD operations?
- Define access control for general entities?
- Streamline data storage?
- Optimize query performance?
- Standardize access to simplify node access checks?

Proposed solution: 

Many possible solutions:

- Expand or remove the access operation whitelist.
- Move to entity-based grant storage.
- Remove complex access from core.

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