Adopt esbuild for the esm release of monaco-css

monaco-editor-webpack-plugin/test/index.js

@@ -1,6 +1,6 @@
 import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';
 
 monaco.editor.create(document.getElementById('container'), {
-	value: 'console.log("Hello, world")',
-	language: 'javascript'
+	value: 'sel {\nbackground: red;\n}',
+	language: 'css'
 });