KIP-21: SynthSwap

Summary Introduce ERC20 token and ETH to/from Synth swaps to the current SynthSwap product on Kwenta for traders.

Abstract Leveraging 1inch (Smart Contracts and API) and Synthetix, Kwenta will enable the exchange of any ERC20 tokens for any synths (and vice versa) directly on our platform. The first iteration will support most ERC20 tokens that can be swapped on 1inch but will withhold the ability to add custom tokens for swaps.

Motivation SynthSwap currently only allows exchange between synthetic assets (sUSD, sETH, sBTC, etc.). Building out the functionality of our swap product will provide a better UX for Kwenta users while also reducing onboarding constraints for traders.

Specification See full KIP here: https://kips.kwenta.io/kips/kip-21/