Allow output amount to be swapped into input amount when a user attempts to reverse the input / output

[0xean]

https://jam.dev/c/f5ff458c-0ce9-4f20-94d2-54ca19368830

Repro steps:

1. create a quote
2. click the down arrow to swap assets
3. See that it doesn't swap the assets amounts as user might expect.

Potential solution:

Effectively we want to take the fiat value of the current sell asset, and input that fiat amount worth of buy asset on switch.

[gomesalexandre]

@0xean what's the expected behaviour here, for the value in sell asset to become the same one in buy asset, with the assets reversed i.e something like this?

If so, unfortunately we can't do that, as buy asset value is not an input, i.e we don't (as most of the swappers don't either) support the notion of getting a quote denominated in buy asset value.