Base: Add SwapRouter02

[m-lord-renkse]

Description

Add SwapRouter02 to Base, since SwapRouter is not available. The interface for the function we use (ExactOutputSingle) is the same for SwapRouter02 and SwapRouter.

[fleupold]

Is my understanding correct that SwapRouter02 is the new contract that combines the v2 and v3 router?

I wonder if in this case it makes sense to update the deployments to all use the new router? But I guess we would still need the v2 router for Gnosis

[m-lord-renkse]

Is my understanding correct that SwapRouter02 is the new contract that combines the v2 and v3 router?

That is what I understand too. It definitely has the same interface for the call that we use.

I wonder if in this case it makes sense to update the deployments to all use the new router? But I guess we would still need the v2 router for Gnosis

Yeah, I was afraid of creating a mess by adding different versions. My idea was to first merge this one since it is just for Base, see how it works, and then update the rest. WDYT?