New surplus auction simulation on the latest block

[KirillDogadin-std]

Closes #448

Checklist:

• issue number linked above after pound (#)
  • replace "Closes " with "Contributes to" or other if this PR does not close the issue
• issue checkboxes are all addressed
• manually checked my feature / not applicable
• wrote tests / not applicable
• attached screenshots / not applicable

[valiafetisov]

Do you also want to create a test like debt-test.ts to validate that it works in the CI?

[KirillDogadin-std]

Do you also want to create a test like debt-test.ts to validate that it works in the CI?

with this pr's topic it would be surplus-test.ts

I suggest opening a separate issue and resolving it there for both simulations unless you're against it for some reason.

[valiafetisov]

Alright, let's open a new issue then to add a full-blown test for each step of the auction!

[valiafetisov]

• ✅ Was able to start and participate in the surplus auction using new simulation
  • ✅ setting allowance
  • ✅ bidding
  • ✅ collecting

Although some problems got found which would also be addressed in the next PR:

• Price on uniswap is not fetched
• Next lowest bid is set to 0 (which is not accepted by the protocol). We need to set it to > 0, at least one 1 * 10^-18
  • Since keeper will be using it to make first bid, we should make it more realistic, eg a uniswap price * gap to reach 1k net profit
• Auction state displays a date, not state
• After the auction ended it still counts down (not up) for some reason (possibly invalid determination of the earliestEndDate?)