* Update MixinLido to support stETH wrapping/unwrapping * Update LidoSampler and asset-swapper * Re-use token address constants in LIDO_INFO_BY_CHAIN * Update CHANGELOG.json * Add stETH <-> wstETH to TokenAdjacencyGraph * Change lido gas schedule code style * Move allowance approval inside the wrap branch * Refactor LidoSampler to reduce its bytecode size