Member management and security

[zjkmxy]

Currently everyone bootstrapped into the workspace is equal in role. However, we do think that privilege / permission management will be important when people start using it in real life. We need a design for this.

Also, if possible, we may allow workspace owners to create workspaces and manage members within the app, and get rid of the dependency on the external ndncert server.

We may use Yjs docs to do user management, but the entanglement of sync and security will make things extremely complicated.

[zjkmxy]

• We decided to go with two modes: Initiator-only and Peer-to-peer. Detailed design is under discussion
• How to support multiple devices of one user is under discussion. We may change the namespace to adapt this.