base support for 'DEV' env or we can choose whether to use absolute path in dev mode

[suanmei]

Is your feature request related to a problem? Please describe.
With the help of egg-view-static in midway/egg ，ctx.render my server's HTML template。For example，midway create a server on port 6001, vite create a server on port 3000, in HTML Template, load js file as

<!-- if development -->
<script type="module" src="http://localhost:3000/@vite/client"></script>
<script type="module" src="http://localhost:3000/main.js"></script>

There is no problem.

but if I import jpg in tsx file, the asset url in js is /assets/xxx.png. The page will try to load localhost:6001/assets/xxx.png instead of localhost:3000/assets/xxx.png

Describe the solution you'd like
Add a configuration item, we can choose whether to use absolute path(include localhost:3000) in development mode, rather than relative path

Describe alternatives you've considered
base support for 'DEV' env

[leevigraham]

Related: #1539

[yyx990803]

The docs already mentioned it: add an egg middleware to serve static assets from your vite directory.