Implement adapter integration test and use it on uniswap and balancer

evm/src/balancer-v2/BalancerV2SwapAdapter.sol

@@ -188,10 +188,11 @@ contract BalancerV2SwapAdapter is ISwapAdapter {
         override
         returns (Capability[] memory capabilities)
     {
-        capabilities = new Capability[](3);
+        capabilities = new Capability[](4);
         capabilities[0] = Capability.SellOrder;
         capabilities[1] = Capability.BuyOrder;
         capabilities[2] = Capability.PriceFunction;
+        capabilities[3] = Capability.HardLimits;
     }
 
     function getTokens(bytes32 poolId)

evm/src/interfaces/ISwapAdapterTypes.sol

@@ -30,7 +30,10 @@ interface ISwapAdapterTypes {
         TokenBalanceIndependent,
         // Indicates that prices are returned scaled, else it is assumed prices
         // still require scaling by token decimals. (required)
-        ScaledPrices
+        ScaledPrices,
+        // Indicates that if we try to go over the sell limits, the pool will
+        // revert (optional)
+        HardLimits
     }
 
     /// @dev Representation used for rational numbers such as prices.