ZkSafe 2.0

[valeryz]

Goal

Extend the zkSafe functionality so that more users can find it attractive as a mechanism for their use case.

Reasons: we control the code of the UI, which includes WalletConnect, Address book, and a few other essential features, ZK privacy is also increasingly important, as it is much easier to be able to reuse signing addresses across many safes. We also need to let users find Safes where they are signers.

Scope:

1. Integrate Private owners #10 .
2. Modify the UI to handle private owners in addition to current ones.
3. Audits of the modifications.
4. Additional testing of the UI to detect and fix rough edges.