This adds support to Effect v4, but also keeps the compatibility for v3.
There is no way that we can unit test against v3, as the
`devDependencies` need to use `effect@4` and an updated `@effect/vitest`
version, which is not compatible with Effect v3 (this is added in

The API for Effect v4 has changed a little, so there are safeguards to
detect if it is v3 or v4 and uses the correct API. The good part is that
for users nothing changed, so they still can use the same methods in
their app as before (ofc, respecting the new Effect v4 API).

Before (Effect v3):

```ts
const SentryLive = Layer.mergeAll(
  Sentry.effectLayer({
    dsn: '__DSN__',
    tracesSampleRate: 1.0,
    enableLogs: true,
  }),
  Layer.setTracer(Sentry.SentryEffectTracer),
  Logger.replace(Logger.defaultLogger, Sentry.SentryEffectLogger),
  Sentry.SentryEffectMetricsLayer,
);
```

After (Effect v4):

```js
const SentryLive = Layer.mergeAll(
  Sentry.effectLayer({
    dsn: '__DSN__',
    tracesSampleRate: 1.0,
    enableLogs: true,
  }),
  Layer.succeed(Tracer.Tracer, Sentry.SentryEffectTracer),
  Logger.layer([Sentry.SentryEffectLogger]),
  Sentry.SentryEffectMetricsLayer,
);
```

Both usages still work and are represented in the E2E tests.