Reward estimate this epoch

[ckpringle]

Story

As a user I want to see my estimated rewards this epoch So that I can understand the sort of rewards I might earn from my current behaviour

Acceptance criteria 

• [ ] I can see estimated earnings each reward type that I am currently participating in
• [ ] I can see what the estimate is based on for each i.e. based on the # of maker fees paid, liquidity fees paid, etc.

Notes:

Likely deprioritised as the reward pools are not fixed during an epoch, only at epoch end, and could be misleading.