Description: add support for native wrapping and unwrapping of stETH <-> wstETH, similar to how to handle native wrapping of ETH <-> wETH.
UX:
- Display the Wrap button instead of Swap
- Price quotes and Auto Router UI should be hidden
- P1: support on L2 networks
- P2: support on testnets
Scope: roughly 1 day of engineering work. Don't think we can fit this in December, so leaving open as a good first issue for the community!