add raw swap to enable providing sqrt price limit to router

[johnny-emp]

Related Issue

Which issue does this pull request resolve?
#473

Description of changes

I add an additional action to the router, where you can provide the SwapParams directly. I did not do the unchecked serialization, but I wanted to see if there was a strong reason for not including this in the V4Router

[eversoluna]

Great suggestion! Why this PR isn't reviewed yet?

[johnny-emp]

not sure, i don't think they actively respond to communicate PRs. i ended up implementing my own router to expose this, as swapping up to a fixed price is fairly useful when working with more volatile pairs. Looking back at this, it feels very reasonable and so I do wonder why there was never even a single comment from the team...