Reintroduce staking rewards based on historical value of ETH

[LefterisJP]

Abstract

We used to have the "historical" value of ETH in the staking view for all staking rewards as an option. We need it back.

Task

Many people use that view for calculation of tax liabilities too so we need to be able to say how much the gained ETH was worth with price at the time of each event at the sumup.

Probably with a button as a choice to switch between current price and historical price as historical price will require more work.