Per editor Connect support v0.1

- Basic plumbing to support connections for a URI rather than global connections. Typical use case is editor requests to connect, but this isn't the only possible use
- Tests pass but need updating to cover new functionality, and re-enable AutoCompleteService test once there is a ServiceDiscovery component that registers and returns services. This is necessary as .Instance won't allow for dependency injection and proper testing.

test/Microsoft.SqlTools.ServiceLayer.Test/Utility/TestObjects.cs

@@ -41,6 +41,15 @@ namespace Microsoft.SqlTools.Test.Utility
 #endif
         }
 
+        public static ConnectParams GetTestConnectionParams()
+        {
+            return new ConnectParams() 
+            {
+                OwnerUri = "file://some/file.sql",
+                Connection = GetTestConnectionDetails()
+            };
+        }
+
         /// <summary>
         /// Creates a test connection details object
         /// </summary>