Move from u128 to u256 (#47)

Author: haider-rs

src/Primitives.sol

@@ -128,8 +128,8 @@ struct Route {
     uint64 gasLimit;
     uint128 baseFee;
     bytes32 gateway;
-    uint128 relativeGasPriceNumerator;
-    uint128 relativeGasPriceDenominator;
+    uint256 relativeGasPriceNumerator;
+    uint256 relativeGasPriceDenominator;
 }
 
 /**

src/utils/GasUtils.sol

@@ -38,7 +38,7 @@ library GasUtils {
      * Obs: To guarantee the overhead is constant regardless the input size, always use `calldata` instead of `memory`
      * for external functions.
      */
-    uint256 internal constant EXECUTION_SELECTOR_OVERHEAD = 474;
+    uint256 internal constant EXECUTION_SELECTOR_OVERHEAD = 496;
 
     /**
      * @dev Base cost of the `IExecutor.execute` method.
@@ -48,7 +48,7 @@ library GasUtils {
     /**
      * @dev Base cost of the `IGateway.submitMessage` method.
      */
-    uint256 internal constant SUBMIT_BASE_COST = 24138 - 96;
+    uint256 internal constant SUBMIT_BASE_COST = 24064;
 
     /**
      * @dev Extra gas cost that any account `Contract or EOA` must pay when calling `IGateway.submitMessage` method.