rename from ts to tsx in pkg and pkg-lib

Summary: mass rename files

Reviewed By: passy

Differential Revision: D33890034

fbshipit-source-id: 1c654a4f7f5b83eaa56a8c11df863003e8d7bed7

desktop/pkg/src/index.tsx

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+export {run} from '@oclif/command';
+export const PKG = 'flipper-pkg';