Add Notebook conversion logic (#1027)

* Add logic to convert Notebook doc into SQL query

* move classes

* Add logic for SQL -> Notebook

* Fix a few trimming issues

src/Microsoft.SqlTools.ServiceLayer/NotebookConvert/Notebook.cs

@@ -0,0 +1,65 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+
+namespace Microsoft.SqlTools.ServiceLayer.NotebookConvert
+{
+    /// <summary>
+    /// Basic schema wrapper for parsing a Notebook document
+    /// </summary>
+    public class NotebookDocument
+    {
+        [JsonProperty("metadata")]
+        public NotebookMetadata NotebookMetadata;
+        [JsonProperty("nbformat_minor")]
+        public int NotebookFormatMinor = 2;
+        [JsonProperty("nbformat")]
+        public int NotebookFormat = 4;
+        [JsonProperty("cells")]
+        public IList<NotebookCell> Cells = new List<NotebookCell>();
+    }
+
+    public class NotebookMetadata
+    {
+        [JsonProperty("kernelspec")]
+        public NotebookKernelSpec KernelSpec;
+        [JsonProperty("language_info")]
+        public NotebookLanguageInfo LanguageInfo;
+    }
+
+    public class NotebookKernelSpec
+    {
+        [JsonProperty("name")]
+        public string Name;
+        [JsonProperty("display_name")]
+        public string DisplayName;
+        [JsonProperty("language")]
+        public string Language;
+    }
+
+    public class NotebookLanguageInfo
+    {
+        [JsonProperty("name")]
+        public string Name;
+        [JsonProperty("version")]
+        public string Version;
+    }
+
+    /// <summary>
+    /// Cell of a Notebook document
+    /// </summary>
+    public class NotebookCell
+    {
+        public NotebookCell(string cellType, IList<String> source)
+        {
+            this.CellType = cellType;
+            this.Source = source;
+        }
+
+        [JsonProperty("cell_type")]
+        public string CellType;
+
+        [JsonProperty("source")]
+        public IList<string> Source;
+    }
+}