Prometheus RSocket Client not initialized when spring.main.lazy-initialization=true

Currently we have an issue that the `PrometheusRSocketClientAutoConfiguration` does not initialize the `PrometheusRSocketClient` when the `lazy-initialization` is set to `true`.

I guess this is because `PrometheusRSocketClient` is not required anywhere due to autowiring.

Suggestion would be to add `@Lazy(false)` and test if this is working in this case.

@onobc / @jonatan-ivanov WDYT?

Start in PrometheusRSocketClientAutoConfiguration and reproduce the issue with spring.main.lazy-initialization=true. Check whether PrometheusRSocketClient is initialized without autowiring, then verify that the proposed @Lazy(false) behavior works in this configuration.

Written by the indexing model from the issue text.