InlineChunkHtmlPlugin should respect `defer` attribute.

Created by: Kingwl

Describe the bug

As the recently html-webpack-plugin. scriptLoading is set to defer by default.

With the defer, html-webpack-plugin will generate an html and put the script tag before body with defer attribute.

After InlineChunkHtmlPlugin. All script will be put at the position of the script tag (before body). That means you will not able to access all the dom element.

We might have to wrap all the script into a DOMContentLoaded handler if script has defer attribute. Or just put all the script after body.