This is one of many PRs to create the effect SDK. Once this has been
merged I will open the draft PR for the effect sdk and create the plan
in there.

(the almost final SDK can be viewed here:
https://github.com/getsentry/sentry-javascript/tree/jp/effect-sdk. It
might be that some specifics change, especially when having browser +
server split, and with tracing)

---

This PR focuses on the base skaffolding of `@sentry/effect`. This on its
own is not really doing anything except setting up the skaffold. The
README already reflects the actual usage, while the export doesn't exist
yet, this will come in another PR (also `init` is exposed here, just for
the sake of completeness)

---------

Co-authored-by: Claude <[email protected]>

…9649)

That adds now the functionality to use the `Sentry.effectLayer`
properly. **But** it doesn't do anything, which means right now, to keep
the PRs small, it returns an empty layer.

Following can be used without any Sentry functionality:

```js
const MainLive = HttpLive.pipe(Layer.provide(Sentry.effectLayer({
  dsn: "",
  tracesSampleRate: 1.0,
  debug: true,
})))

MainLive.pipe(Layer.launch, NodeRuntime.runMain)
```

This adds tracing to the `Sentry.effectLayer`. By setting
`tracesSampleRate: 1.0` in the options tracing is enabled and spans can
be send to Sentry

This adds the functionality to send logs to Sentry by setting
`enableLogs: true` in the `Sentry.effectLayer`