Add Fraxswap adapter

[halo3mic]

Add adapter to query and swap through Fraxswap on Avalanche.

• Fraxswap contract on Avalanche
• Fraxswap github repo
• Guide to adding new adapter

[dragoonzx]

Hi, @halo3mic
Why do we need a separate adapter for Fraxswap, won't the UniswapV2Adapter work? Maybe I don't understand it well, I would be glad if you could explain it to me

Also, it seems they've updated to the V2, here's a link to a working FraxswapFactory

[halo3mic]

@dragoonzx

Why do we need a separate adapter for Fraxswap, won't the UniswapV2Adapter work?

It does seem like it would, in which case deploy script and tests need to be written

Also, it seems they've updated to the V2, here's a link to a working FraxswapFactory

Thanks!