[Feature Request] add optional searchable raw text export

[s-light]

Clear and concise description of the problem

if i import a bunch of files and like to implement a text-based search i would like to have the raw markdown-text - or even better - a raw text version of the final renderd thing -
in the second option that would mean that all plugins could do there magic and i get the magic in the searchable text too..

Suggested solution

just a similar option to exportFrontmatter
like exportSearchableContent
and if set, there is an additionally field in the module export named searchableContent

Alternative

maybe this is already possible via some hacky-way in the transforms-after..

other ideas to implement a nice searching way is also welcome.

currently i am doing a second import with the ?raw switch set..

const getPartsContent = () => {
    return import.meta.glob(`../../public/mks/parts/*/readme.md`, {
        eager: true,
    })
}
const getPartsContentText = () => {
    return import.meta.glob(`../../public/mks/parts/*/readme.md`, {
        query: '?raw',
        eager: true,
    })
}

and then combining the output to an object with the needed keys...

Additional context

No response

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