Fs folders routes

[okalil]

Closes #12647

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[markdalgleish]

Thanks for the PR!

Could you look at also porting over the test from here? https://github.com/remix-run/v1-compat-utils/blob/main/packages/v1-route-convention/__tests__/index-test.ts

[markdalgleish]

Could you rename this to nestedRoutes?

Also, similar to the flatRoutes function above, could you make this accept a "rootDirectory" option, and use getAppDirectory internally to resolve the app directory from the user's config? Right now the app/routes directory is hard coded but this should be configurable.