feat(server): support load SSR module

[9aoy]

Summary

update server environment api, provide some SSR related APIs for users to use:

type RsbuildDevServer = {
  ...
  environments: {
    [name: string]: {
      ...
      loadBundle: <T>(entryName: string) => Promise<T>;  // Used to load and execute stats bundle.
      getTransformedHtml: (entryName: string) => Promise<string>; //  used to get the compiled HTML template.
    }
  };
};

usage:

import { createRsbuild } from '@rsbuild/core';
import express from 'express';

 export const serverRender = (rsbuild, entryName) => async (req, res, next) => {
+  const { render } = await rsbuild.environments.ssr.loadBundle(entryName);
+
+  const markup = render();
+
+  const template = await rsbuild.environments.web.getTransformedHtml(entryName);
+
+  const html = template.replace(`<!--app-content-->`, markup)
+
+  res.status(200).set({ 'Content-Type': 'text/html' }).send(html)
};

export async function startDevServer() {
  const rsbuild = await createRsbuild({});

  const app = express();

  const rsbuildServer = await rsbuild.createDevServer();

+ app.get('/', serverRender(rsbuild, 'index'))

  app.use(rsbuildServer.middlewares);
  
  ....
}

Related Links

#2221

#2620

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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