Azure SQL Hybrid Cloud Toolkit Notebooks Extension Command (#13286)

* added extension folder incomplete

* WIP extension progress

* notebook finally opens in side panel

* notebook now opens via notebook extension

* html file spaces restored

* package json fixed

* fixed vscode import issue

* more cleanup

* remove git stuff

* placeholder icon logos added

* fixed gulpfile

* cleanup changes

* vscode import fixed

* fixed main and yarn.lock

* added provided notebooks view

* formatting for package.json

* removed first command as its not necessary

* fixed notebook typo

* readded spaces

extensions/azurehybridtoolkit/notebooks/hybridbook/Components/ADP/SqlPackageWrapper/Constants.cs

@@ -0,0 +1,39 @@
+namespace SqlPackageWrapper
+{
+    /// <summary>
+    /// Constants for the batch wrapper.
+    /// </summary>
+    public static class Constants
+    {
+        /// <summary>
+        /// Environment variable names present or needed during the batch task execution.
+        /// </summary>
+        public static class EnvironmentVariableNames
+        {
+            /// <summary>
+            /// Path to the directory containing the batch wrapper exe.
+            /// </summary>
+            public const string WrapperLocation = "AZ_BATCH_APP_PACKAGE_BATCHWRAPPER";
+
+            /// <summary>
+            /// Path to the directory containing the sqlpackage exe.
+            /// </summary>
+            internal const string SqlPackageLocation = "AZ_BATCH_APP_PACKAGE_SQLPACKAGE";
+
+            /// <summary>
+            /// Path to the working directory assigned to the batch task.
+            /// </summary>
+            internal const string TaskWorkingDir = "AZ_BATCH_TASK_WORKING_DIR";
+
+            /// <summary>
+            /// Path to the working directory assigned to the batch task.
+            /// </summary>
+            internal const string AzBatchTaskId = "AZ_BATCH_TASK_ID";
+
+            /// <summary>
+            /// Path to the working directory assigned to the batch task.
+            /// </summary>
+            internal const string JobContainerUrl = "JOB_CONTAINER_URL";
+        }
+    }
+}