Add setting to customize notebook markdown preview line height (#13923)

* add md preview line height settings

* remove if condition

* listen for configuration change

* change setting description

* only change line height outside of edit mode

* set minimum line height to 1

* combine ondidchangeconfiguration callbacks

src/sql/workbench/contrib/notebook/browser/notebook.contribution.ts

@@ -231,6 +231,12 @@ configurationRegistry.registerConfiguration({
 			'default': false,
 			'description': localize('notebook.saveConnectionName', "(Preview) Save connection name in notebook metadata.")
 		},
+		'notebook.markdownPreviewLineHeight': {
+			'type': 'number',
+			'default': 1.5,
+			'minimum': 1,
+			'description': localize('notebook.markdownPreviewLineHeight', "Controls the line height used in the notebook markdown preview. This number is relative to the font size.")
+		}
 	}
 });