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/TychoRouter.t.sol

@@ -1461,4 +1461,18 @@ contract TychoRouterTest is TychoRouterTestSetup {
 
         vm.stopPrank();
     }
+
+    function testCurveIntegrationStETH() public {
+        deal(ALICE, 1 ether);
+
+        vm.startPrank(ALICE);
+        // Encoded solution generated using `test_split_encoding_strategy_curve_st_eth`
+        (bool success,) = tychoRouterAddr.call{value: 1 ether}(
+            hex"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"
+        );
+
+        assertEq(IERC20(STETH_ADDR).balanceOf(ALICE), 1000754689941529590);
+
+        vm.stopPrank();
+    }
 }