feat(@angular/ssr): add modulepreload for lazy-loaded routes

[alan-agius4]

Enhance performance when using SSR by adding modulepreload links to lazy-loaded routes. This ensures that the required modules are preloaded in the background, improving the user experience and reducing the time to interactive.

Closes #26484

[alan-agius4]

I think my biggest concern is that I'm not sure how comfortable I am .toString()-ing a function and parsing out the dynamic import() statement at runtime in a production server.

This only happens during the build, when building the manifest, on a production server the preloads are already extracted.

[dgp1130]

Just responding to some comment threads, I'll take another look at the code on Monday.

[dgp1130]

No major concerns on my end. I'm on board with an initial implementation like this and we can work through any edge cases or deoptimizations as they come.

I kind of suspect we'll want to expand the transform to apply to any dynamic import inside a loadComponent / loadChildren function, but I'm happy to keep this constrained for now and expand it later.

[AndrewKushnir]

LGTM, thanks @alan-agius4 👍

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