add support for recursive selection and deselection of files in the tree view

.vscode-test.mjs

@@ -0,0 +1,10 @@
+import * as path from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+export default {
+  version: 'stable',
+  extensionDevelopmentPath: __dirname,
+  extensionTestsPath: path.join(__dirname, 'out', 'test')
+};