Add support of XM Cloud site-specific error pages

[ivanbuzyka]

What would you add to the SDK?

Similarly to Next.js JSS, add support of site-specific error pages that can be now configured in XM Cloud portal.

I guess, there should be a way to get the site-specific error page (404 or 500) (in the LayoutResponse?), so that developer can redirect to that page e.g. in the DefaultController of head application.

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