Allow connection to archive ethereum CL node

[LefterisJP]

Description

Either we or the users may be running an ethereum archive CL node.

If we connect to one then we can get more info about the CL such as attestation rewards per validator or historical balances via the normal API seen here: https://ethereum.github.io/beacon-APIs/

It may be beneficial to allow users to do so if they have an archive one running. Most won't since running a staker does not require it and staking is all about performance.

But we could also eventually run one on our own and offer it as a paid part of premium

Task

• Detect if the connected consensus layer node is archive. Queryng perhaps balance at epoch 1 or something?
• Use the historical attestations and balance APIs from the connected node