feat(compiler-core): switch to @babel/parser for expression parsing

This enables default support for parsing bigInt, optional chaining
    and nullish coalescing, and also adds the `expressionPlugins`
    compiler option for enabling additional parsing plugins listed at
    https://babeljs.io/docs/en/next/babel-parser#plugins.

packages/template-explorer/src/index.ts

@@ -4,6 +4,9 @@ import { compile as ssrCompile } from '@vue/compiler-ssr'
 import { compilerOptions, initOptions, ssrMode } from './options'
 import { watchEffect } from '@vue/runtime-dom'
 import { SourceMapConsumer } from 'source-map'
+import { parse } from '@babel/parser'
+
+window._deps['@babel/parser'] = { parse }
 
 declare global {
   interface Window {