* client-side smart order router support
* support auto router on L2s
* add swap router version in approval/swap callback GA events to save $ on approval txs
* add persistent UI view of gas estimate on L1s
Co-authored-by: Lint Action <lint-action@samuelmeuli.com>
Co-authored-by: Ian Lapham <ian@uniswap.org>
Co-authored-by: Callil Capuozzo <callil.capuozzo@gmail.com>