feat: Implement correlation on event filter

[matheusandre1]

Many thanks for submitting your Pull Request ❤️!

What this PR does / why we need it: Closes: #1206

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[fjtirado]

You need to separate the DSL gap PR you were working on from the Correlation one.

[Copilot]

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[matheusandre1]

@fjtirado I will send the other file separately after you review this one.

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Pull request overview

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Comments suppressed due to low confidence (1)

fluent/spec/src/main/java/io/serverlessworkflow/fluent/spec/AbstractEventFilterBuilder.java:51

• AbstractEventFilterBuilder always sets an EventFilterCorrelate instance on the filter in build(), even when correlate() was never called. This can change serialization output (emitting an empty correlate object) and, more importantly, can surface null-map cases downstream (e.g., engine code that assumes correlate.additionalProperties is non-null). Consider only setting correlate when at least one correlation entry was added, or ensure the correlate builder initializes an empty map so getters never return null.

  protected final EventFilter filter = new EventFilter();
  protected final EventFilterCorrelate correlate = new EventFilterCorrelate();

  protected abstract SELF self();

  protected abstract P newEventPropertiesBuilder();

  public SELF with(Consumer<P> c) {
    P pb = this.newEventPropertiesBuilder();
    c.accept(pb);
    filter.setWith(pb.build());
    return self();
  }

  public SELF correlate(
      String key, Consumer<? super AbstractListenTaskBuilder.CorrelatePropertyBuilder> c) {
    AbstractListenTaskBuilder.CorrelatePropertyBuilder cb =
        new AbstractListenTaskBuilder.CorrelatePropertyBuilder();
    c.accept(cb);
    correlate.setAdditionalProperty(key, cb.build());
    return self();
  }

  public EventFilter build() {
    filter.setCorrelate(correlate);
    return filter;
  }

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