[EPIC] Doc Encryption

[islamaliev]

Implement a robust, end-to-end document encryption system integrated with Access Control Policies (ACP) to enhance data security and privacy in our decentralized network.

Key Objectives:

1. Enable selective encryption for entire documents or specific fields
2. Implement secure key exchange mechanism
3. Integrate with Access Control Policies for fine-grained permission management
4. Ensure seamless encryption/decryption process during document creation, updates, and retrieval
5. Optimize performance for large-scale deployments

This epic will cover the full lifecycle of encrypted documents, from creation to sharing and access revocation, while maintaining the system's decentralized nature. It will leverage our existing CRDT-based data model and extend it to handle encrypted deltas securely.

The implementation will ensure that only authorized users can access encrypted content, with ACP determining the distribution and management of encryption keys. This approach will significantly enhance our platform's security posture, enabling confidential data storage and transmission in a decentralized environment.

- [ ] https://github.com/sourcenetwork/defradb/issues/2809
- [ ] https://github.com/sourcenetwork/defradb/issues/2856
- [ ] https://github.com/sourcenetwork/defradb/issues/2909
- [ ] https://github.com/sourcenetwork/defradb/issues/2893
- [ ] https://github.com/sourcenetwork/defradb/issues/2894
- [ ] #2769
- [ ] https://github.com/sourcenetwork/defradb/issues/2895
- [ ] https://github.com/sourcenetwork/defradb/issues/2896