feat(@angular/ssr): add getHeaders method to AngularAppEngine and AngularNodeAppEngine for handling pages static headers

[alan-agius4]

feat(@angular/ssr): Add getHeaders Method to AngularAppEngine and AngularNodeAppEngine for handling pages static headers

This commit introduces a new getHeaders method to the AngularAppEngine and AngularNodeAppEngine classes, designed to facilitate the retrieval of HTTP headers based on URL pathnames for statically generated (SSG) pages.

const angularAppEngine = new AngularNodeAppEngine();

app.use(express.static('dist/browser', {
  setHeaders: (res, path) => {
    // Retrieve headers for the current request
    const headers = angularAppEngine.getHeaders(res.req);

    // Apply the retrieved headers to the response
    for (const { key, value } of headers) {
      res.setHeader(key, value);
    }
  }
}));

In this example, the getHeaders method is used within an Express application to dynamically set HTTP headers for static files. This ensures that appropriate headers are applied based on the specific request, enhancing the handling of SSG pages.

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feat(@angular/ssr): introduce AngularNodeAppEngine API for Node.js integration

Expose a variant of AngularAppEngine tailored for Node.js. These additions streamline the process by minimizing boilerplate code and eliminate the need for users to call createWebRequestFromNodeRequest before invoking the render method.

[dgp1130]

Mostly looks good, lots of little comments just to make sure I understand the use case and how this fits into the architecture.

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