An oracle-free mev-sharing solution spike

[OisinKyne]

Problem to be solved

A service we would like to offer DVs is the ability to opt into a pooling fee_recipient address. It must be fair, equal, and ungameable. It should not have a dependence on a trusted off chain party telling the smart contract who has contributed what/what to distribute to everyone.

Proposed solution

Make a spike doc where we gather examples such as rocketpool and smoothly and lido etc. See if we could do something with like 4626 vault contracts, or 0xsplits contracts. Work with Oisin on selecting a PoC to make after this exploratory research is complete.