feat: Support Curve ETH

Curve pools use a different address from ETH (native token)

- Pass Chain into the SwapEncoderBuilder and SwapEncoder
- Add native_token_curve_address and native_token_address to CurveSwapEncoder
- Added integration test for this curve case

--- don't change below this line ---
ENG-4306 Took 1 hour 4 minutes


Took 11 seconds

foundry/test/executors/CurveExecutor.t.sol

@@ -50,7 +50,7 @@ contract CurveExecutorTest is Test, Constants {
     function setUp() public {
         uint256 forkBlock = 22031795;
         vm.createSelectFork(vm.rpcUrl("mainnet"), forkBlock);
-        curveExecutorExposed = new CurveExecutorExposed(ETH_ADDR);
+        curveExecutorExposed = new CurveExecutorExposed(ETH_ADDR_FOR_CURVE);
         metaRegistry = MetaRegistry(CURVE_META_REGISTRY);
     }
 
@@ -105,7 +105,8 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(address(curveExecutorExposed), amountIn);
 
-        bytes memory data = _getData(ETH_ADDR, STETH_ADDR, STETH_POOL, 1);
+        bytes memory data =
+            _getData(ETH_ADDR_FOR_CURVE, STETH_ADDR, STETH_POOL, 1);
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -203,7 +204,8 @@ contract CurveExecutorTest is Test, Constants {
         uint256 initialBalance = address(curveExecutorExposed).balance; // this address already has some ETH assigned to it
         deal(XYO_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data = _getData(XYO_ADDR, ETH_ADDR, ETH_XYO_POOL, 2);
+        bytes memory data =
+            _getData(XYO_ADDR, ETH_ADDR_FOR_CURVE, ETH_XYO_POOL, 2);
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);