Add support for Next.js cache instrumentation

### Problem Statement

We support manually instrumenting caching, but this is a pain to figure out: [https://docs.sentry.io/platforms/javascript/guides/nextjs/tracing/instrumentation/custom-instrumentation/caches-module/]()

### Solution Brainstorm

We should either
a) auto-instrument the Next.js cache via [https://nextjs.org/docs/app/api-reference/next-config-js/incrementalCacheHandlerPath]()
b) update the cache module docs if auto-instrumentation is not possible.