Omit route components from non-SSR builds when ssr: false

[Brendonovich]

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• Tests for the changes have been added (for bug fixes / features)

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What kind of change does this PR introduce?

• Bugfix
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• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
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What is the current behavior?

When building with ssr: false, the ssr + server-fn builds still transform + bundle all of the route components in filesystem routes.
This doesn't really make sense, since the ssr build will only ever be used during prerendering, which just renders entry-server.tsx and app.tsx, and server-fn only invokes App with dataOnly set on the router so none of the route components are actually used.

What is the new behavior?

This PR adds a dataOnly config to SolidStartServerFileRouter which makes it omit the default exported component from all routes. Non-default exported components work the same and export const route is still included since it's needed on the server for SFM.

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[ryansolid]

That's awesome.. Thank you. I was meaning to look at this and I'm pretty stoked that you applied this optimization.

[ryansolid]

Hmm.. it breaks the notes demo. It is no longer single flight in SSR false. Which suggests something isn't working the way it should. I will see if I can figure it out in the next 30 mins otherwise moving forward with the release I might have to temporarily revert this.