Select Payout Chain

**User Story:**
As a funder
I want to first select a chain that my payout will occur on
So that the rest of the payout information only allows me to select relevant data to that chain

**Acceptance Criteria**

**Form Initiation**
GIVEN I am creating a bounty
WHEN i click next on the bounty details step
THEN I will be taken to the next step titled "Payment Information"
AND I will see a drop down to select a chain where my payout will occour
AND this list should be predefined and match whats existing in bounty creation today
AND the token field and amount field will be disabled

**Selecting a chain**
GIVEN I am creating a bounty
AND i am on the Payment information step
WHEN i select a chain from the chain drop down
THEN the dropdown will close with that chain in focus
AND the token field should now be enabled (SEPERATE STORY FOR TOKEN BEHAVIOR)
AND the amount field should remain disabled

**Changing a chain - (does this belong here or in token story)**
GIVEN i am entering payment info on the bounty creation wizard
AND i have previously selected a payout chain
WHEN i change that payout chain
THEN the token field should reset and be enabled
AND the amount field should go back to disabled

**Product & Design Links:**

**Open Questions:**
- We want to include the icons for each chain in the drop down, do we have that available to us?

**Notes/Assumptions:**