Retrieve network raw power for block validation

[dutterbutter]

Task summary

Determining if a ticket is a winner requires the claimed power and total network power. We need the ability to retrieve these values during block validation to be used for determining a ticket winner.

Specification reference

• Lotus GetPower reference
• Where its used in block validation

Other information and links

In our codebase, the retrieval of these two power params would likely be called from the Chainsyncer component during the validation process. And would likely live under the StateManager component.