Stubbing out query execution settings

Adding a setting for batch separator.
Very small refactor to WorkspaceService that will create the basic
settings upon construction of the object.

src/Microsoft.SqlTools.ServiceLayer/SqlContext/QueryExecutionSettings.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Microsoft.SqlTools.ServiceLayer.SqlContext
+{
+    public class QueryExecutionSettings
+    {
+        private const string DefaultBatchSeparator = "GO";
+
+        private string batchSeparator;
+
+        public string BatchSeparator
+        {
+            get { return batchSeparator ?? DefaultBatchSeparator; }
+            set { batchSeparator = value; }
+        }
+
+        /// <summary>
+        /// Update the current settings with the new settings
+        /// </summary>
+        /// <param name="newSettings">The new settings</param>
+        public void Update(QueryExecutionSettings newSettings)
+        {
+            BatchSeparator = newSettings.BatchSeparator;
+        }
+    }
+}