add new test for calculator and comply to folder structure

commerce/domain/inventory/cart/calculator/classes/InventoryCartCalculatorSample.cls

@@ -0,0 +1,40 @@
+public class InventoryCartCalculatorSample extends CartExtension.InventoryCartCalculator {
+
+    public InventoryCartCalculatorSample() {
+        super();
+    }
+
+     /**
+     * @description Constructor used by unit tests only. 
+     * @param apexExecutor Executor which executes various calculators. Can be used to stub calculation results or delegate calculations to actual Calculator. See <<CartCalculateExecutorMock>>.
+     */
+    public InventoryCartCalculatorSample(CartExtension.CartCalculateExecutorMock apexExecutor) {
+        // Must call super constructor in order for provided Executor to be used for calculations
+        super(apexExecutor);
+    }
+
+    public virtual override void calculate(CartExtension.CartCalculateCalculatorRequest request) { 
+
+        CartExtension.Cart cart = request.getCart();    
+
+        if (cart.getStatus() != CartExtension.CartStatusEnum.CHECKOUT) {
+            return;
+        }
+
+        removeAllCVOsOfType(cart, CartExtension.CartValidationOutputTypeEnum.INVENTORY);
+        super.calculate(request);
+
+    }
+
+    private void removeAllCVOsOfType(CartExtension.Cart cart, CartExtension.CartValidationOutputTypeEnum type) {
+        CartExtension.CartValidationOutputList cartValidationOutputList = cart.getCartValidationOutputs();
+        for (Integer i = (cartValidationOutputList.size() - 1); i >= 0; i--) {
+            CartExtension.CartValidationOutput cvo = cartValidationOutputList.get(i);
+            if (cvo.getType() == type) {
+                cartValidationOutputList.remove(cvo);
+            }
+        }
+    }
+
+
+}

commerce/domain/inventory/cart/calculator/classes/InventoryCartCalculatorSample.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>61.0</apiVersion>
+    <status>Active</status>
+</ApexClass>