refactor: Node.js ESM module import include file ending

Node.js ESM stictly follows the ECMAScript spec, which requires module
file endings. Vite, however, is more forgiving. We could consider
updating all project imports for consistency.

Author: dcalhoun

src/utils/logger.js

@@ -1,7 +1,7 @@
 /**
  * Internal dependencies
  */
-import { Platform } from './platform';
+import { Platform } from './platform.js';
 
 // Log levels in order of verbosity
 const LOG_LEVELS = {