GH-37 - Hide internal aggregates and components by default in module canvas.

We now only include exposed types in the module canvas rendered. This can be overridden by calling CanvasOptions.revealInternals().

spring-modulith-core/src/main/java/org/springframework/modulith/model/SpringBean.java

@@ -46,6 +46,16 @@ public class SpringBean {
 		return type.getFullName();
 	}
 
+	/**
+	 * Returns whether the bean is considered to be an API bean, which means it is either a public type exposed in an API
+	 * package of the module or implements a public API interface.
+	 *
+	 * @return
+	 */
+	public boolean isApiBean() {
+		return module.isExposed(type) || !getInterfacesWithinModule().isEmpty();
+	}
+
 	/**
 	 * Returns all interfaces implemented by the bean that are part of the same module.
 	 *