CSUB-961: Add ability to initiate payout for the pool

[zacharyfrederick]

No description provided.

[github-actions]

Test before merge -> Staking Dashboad Preview!

[atodorov]

IMO it makes sense to show how much the rewards are for each era (or grand total whenever the batch functionality becomes available). As a user I will not want to pay high fees to initiate payouts only to find out that my reward is lower than the fees I paid.

See how it looks like if you are nominating directly and claiming your rewards:

I deally when I am a pool member I will be able to see:

• rewards per era (earned only by the pool)
• what I am seeing (should be annotated appropriately) is my personal chunk of the pool reward or a relatively close approximation (claiming rewards from a pool already shows only your personal chunk)

More items:

• once I request a payout for a specific era and the transaction makes it into a block the state of this widget needs to be updated. I was able to request payouts for era 209 3 times in a row without seeing errors