Snapshot strategy with multi-delegation

This strategy should read previous delegations from the already existing snapshot-subgraph, according to the space network configured, and from our new delegations subgraph in Polygon. This will enable us to keep supporting already set delegations, while at the same time enabling multi-delegation. VP will be evenly split between all delegated addresses. (E.g: If an address with 150VP delegates to three addresses, each address will receive 50VP)