Web3Signer w/ keymanager UI project

To increase client diversity among non-technical stakers it's key that all implementations can expose a UI to perform keymanager actions. For context on other explored options please check Road to eth2 multiclients in DAppNode ⧫ #329

Attaching a UI to a separate component (a remote signer) is the frictionless route for the current consensus client teams; since now they only need to implement EIP 3030 and get access to a keymanager UI at no extra development cost.

Consensys web3signer is currently the only productionized, battle tested remote signer. Please reach out to @dapplion if you know of any other implementation with similar security guarantees.

Project summary

• Extend Consensys web3signer to implement a minimal keymanager API as described in this proposed standard https://github.com/ethereum/beacon-APIs/pull/151
• Implement a UI that interacts with a backend following https://github.com/ethereum/beacon-APIs/pull/151
• Participate in the stakers community long term to add requested features and expand the project as needed

I @dapplion can offer mentorship and direction throughout the project.