Porting showplan code from ssms (#1280)

* Porting showplan code from ssms

* Moving showplans bits to a subfolder

* code cleanup

* Remvoing unnecssary conditional visibility

src/Microsoft.SqlTools.ServiceLayer/ShowPlan/ShowPlanGraph/ActualPlanDataReaderNodeBuilder.cs

@@ -0,0 +1,87 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.SqlTools.ServiceLayer.ShowPlan.ShowPlanGraph
+{
+    /// <summary>
+    /// Builds hierarchy of Graph objects from SQL 2000 Actual ShowPlan Record Set
+    /// </summary>
+	internal class ActualPlanDataReaderNodeBuilder : DataReaderNodeBuilder
+    {
+        #region Constructor
+
+        /// <summary>
+        /// Constructs ActualPlanDataReaderNodeBuilder
+        /// </summary>
+        public ActualPlanDataReaderNodeBuilder() : base()
+        {
+        }
+
+        #endregion
+
+        #region Overrides
+
+        protected override ShowPlanType ShowPlanType
+        {
+            get { return ShowPlanType.Actual; }
+        }
+
+        /// <summary>
+        /// Gets index of Node Id in the recordset
+        /// </summary>
+        protected override int NodeIdIndex
+        {
+            get { return 4; }
+        }
+
+        /// <summary>
+        /// Gets index of Parent Id in the recordset
+        /// </summary>
+        protected override int ParentIndex
+        {
+            get { return 5; }
+        }
+
+        /// <summary>
+        /// Gets property names that correspond to values returned
+        /// in each ShowPlan row.
+        /// </summary>
+        /// <returns>Array of property names</returns>
+        protected override string[] GetPropertyNames()
+        {
+            return propertyNames;
+        }
+
+        #endregion
+
+        #region Private members
+
+        private static string[] propertyNames = new string[]
+        {
+            NodeBuilderConstants.ActualRows,       // Rows
+            NodeBuilderConstants.ActualExecutions, // Executes
+            NodeBuilderConstants.StatementText,    // StmtText
+            null,               // StmtId
+            NodeBuilderConstants.NodeId,
+            null,               // Parent
+            NodeBuilderConstants.PhysicalOp,
+            NodeBuilderConstants.LogicalOp,
+            NodeBuilderConstants.Argument,
+            NodeBuilderConstants.DefinedValues,
+            NodeBuilderConstants.EstimateRows,
+            NodeBuilderConstants.EstimateIO,
+            NodeBuilderConstants.EstimateCPU,
+            NodeBuilderConstants.AvgRowSize,
+            NodeBuilderConstants.TotalSubtreeCost,
+            NodeBuilderConstants.OutputList,
+            NodeBuilderConstants.Warnings,
+            NodeBuilderConstants.StatementType,    // Type
+            NodeBuilderConstants.Parallel,
+            null,                // EstimateExecutions
+        };
+
+        #endregion
+    }
+}