chore: Start converting to RRv7 framework mode

[david-crespo]

This is the beginning of both #2019 and #2695.

Following this helpful guide https://reactrouter.com/upgrading/router-provider, we

1. Create a convert function to convert from framework mode route modules with a default export and a clientLoader to what library mode wants, namely a named Component export and a loader.
2. Convert existing <Route> to use lazy={() => import('./path/to/route')}

For this PR we can leave it at that, but eventually we will

3. Convert all the route modules to work that way
4. Shuffle files around and convert routes.tsx to a framework mode route.ts and flip on framework mode by using the RR Vite plugin.

In this PR we also make a couple of other tweaks:

• Allow previously prohibited default exports in the lint config, but only in app/pages and app/layouts
• Set output.experimentalMinChunkSize in the Rollup config so we don't get a ton of 300 byte JS chunks.

With output.experimentalMinChunkSize

Without output.experimentalMinChunkSize

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[david-crespo]

Nice example of what is happening here: we get this for free through the route being split.

Before/After

[david-crespo]

This can be merged as-is, we can convert the rest of the routes gradually.

[david-crespo]

This is just ProjectLayout moved in its entirety. The diff doesn’t show as a rename because the original file is still there, it’s just very short now.