Added

• New GAS_ESTIMATOR_MODE for Arbitrum to support Nitro's multi-dimensional gas model, with dynamic gas pricing and limits.
  • NOTE: It is recommended to remove GAS_ESTIMATOR_MODE as an env var if you have it set in order to use the new default.
  • This new, default estimator for Arbitrum networks uses the suggested gas price (up to ETH_MAX_GAS_PRICE_WEI, with 1000 gwei default) as well as an estimated gas limit (up to ETH_GAS_LIMIT_MAX, with 1,000,000,000 default).
• ETH_GAS_LIMIT_MAX to put a maximum on the gas limit returned by the Arbitrum estimator.