[Next.js] Support setting different options for different runtimes (browser/server/edge)

Originally posted by @ricardomatias [in discussions](https://github.com/getsentry/sentry-javascript/discussions/13833):

> I've removed the sentry.edge.config.ts and sentry.server.config.ts and I still get sourcemaps for both of them. I only want client sourcemaps.

I don't think this is possible right now without some very ugly hacks. We should provide some way of setting different options for the different runtimes.

Idea No.1 and probably my favorite: Allow for the `sentryBuildOptions` argument in `withSentryConfig` to be a function/callback that receives the runtime as an argument. (probably should pass it within an object so that we can extend it in the future)

Comienza por la integración de Next.js conSentryConfig y el manejo de sentryBuildOptions descritos en el issue. Rastrea cómo se identifican los runtimes de browser, server y edge, y determina cómo podría un callback recibir ese runtime. Se considera terminado cuando los llamadores pueden seleccionar distintas opciones de compilación para cada runtime, incluido el comportamiento de los sourcemaps.

Escrito por el modelo de indexación a partir del texto del issue.