Cloudflare Workers support KV tracing

### Problem Statement

Cloudflare workers commonly use KV as a key-value store for caching or even the main database of a worker.

- https://developers.cloudflare.com/kv/

Currently the SDK doesn't provide an out-of-the-box integration tracing KV calls.

### Solution Brainstorm

Add `Sentry.instrumentKVWithSentry` to generate similar spans to the D1 integration.

There is a bit of an interesting consideration here possibly since it's not always used for caching or like a database. So choosing which span's to generate (cache or db) might be a discussion point.