Add an in-app staking history

Right now, the only available solution for getting the staking history is on-chain data exports. That's something we're doing, but we might want to consider representing a staking history somewhere. See below: 

![image](https://user-images.githubusercontent.com/41123852/167824190-40c93570-7362-4b78-bf6d-d881cf13291d.png)
