feat: add permit2 entrypoints to the periphery

[bmzig]

This adds two more functions to the spoke pool periphery contract: depositWithPermit2 and swapAndBridgeWithPermit2. Both use the signature transfer logic in permit2.

There is an assumption that the amount to spend on the permit2 signature is equal to the amount to swap (for a swap and bridge tx) or the amount to deposit (for a deposit tx). I believe that this assumption is correct, since a user should not give the periphery an allowance, so it should only ever transferFrom the amount specified in the permit details anyways.

[nicholaspai]

This looks good. Can you add a forge unit test for swapAndBridgeWithPermit2?

[nicholaspai]

This looks right to me, just have a couple q's

[nicholaspai]

Can you add unit tests for these three TransferType flows? I also think we should move TransferType into this contract as its not really a "signing" related struct

[bmzig]

Tests are here: e3cfb18, moving the type definitions is here 1927810

[nicholaspai]

let's just get unit tests in especially for any behavior in _swapAndBridge. I'm more ok with not having unit tests yet for the external permit/auth/permit2 logic yet but I want to make sure the swapAndBridge() and deposit() functions work well