FEATURE : Support chainWebpack like option

[SquirrelDeveloper]

Hi, This project seems awesome, however, I can't use it because my current UmiJS Max configuration uses

  chainWebpack(memo: any) {
    memo.plugin('monaco-editor').use(MonacoEditorWebpackPlugin, []);
    return memo;
  },

Ans this feature is not yet supported

[stormslowly]

if you just use monaco-editor plugin in chainWebpack, you can reference to this example https://github.com/umijs/mako/blob/master/examples/with-antd/src/pages/monaco-editor.tsx using @monaco-editor/react instead

[SquirrelDeveloper]

Removing the webpackchain option is giving me another error and warning with Umi Max :

  Mako bundler does not support the following options:
  - theme.[object value]

configuration:

theme: {
    'root-entry-name': 'variable',
    token: {
      colorBgSpotlight: '#1d222e',
    },
    components: {
      Modal: {
        contentBg: '#1d222e',
        headerBg: '#1d222e',
      },
    },
  },

And another un-related error:

 fatal - Error: Cannot find module '@umijs/mako-linux-arm64-musl'

[stormslowly]

 fatal - Error: Cannot find module '@umijs/mako-linux-arm64-musl'

i will add this target soon