Add error handling for Azure Exceptions (#177)

* Add error handling for Azure Exceptions

* Add SRGen for string

* Add specific exception messages

* Move DefinitionResult class

* Add SqlLogin constant

* Add error scenarios

* revert timeout duration

* Modify tests

* Modify tests

* Add tests

* Revert live connection definition

* Modify DefinitionsHandlerWithNoConnectionTest

* fix test after merge

* Code review changes

* Code review changes

* Code review changes

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/Contracts/Definition.cs

@@ -14,5 +14,16 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices.Contracts
             RequestType<TextDocumentPosition, Location[]> Type =
             RequestType<TextDocumentPosition, Location[]>.Create("textDocument/definition");
     }
+
+    /// <summary>
+    /// Error object for Definition
+    /// </summary>
+    public class DefinitionError
+    {
+        /// <summary>
+        /// Error message 
+        /// </summary>
+        public string message { get; set; }
+    }
 }