XB pages need to be available to Search API, in the sense that the full rendered component tree will need to be indexed. That's not natively supported by XB, but @mglaman and friends wrote it for another context which they have agreed to open-source.
Let's port their work over to XB. It's got tests and everything!
No obvious ones, except that XB pages will appear in search results.
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Ported the work done by @mglaman and updated it to the more finalized data model. (Also made the tests more readable by favoring yield over giant arrays of data provider scenarios.)