Add all-open option for Kotlin panache

The kotlin-maven-allopen plugin needs to be configured for entity classes.

Author: edeandrea

hibernate-orm-panache-kotlin-quickstart/pom.xml

@@ -145,6 +145,7 @@
                     <pluginOptions>
                         <option>all-open:annotation=jakarta.ws.rs.Path</option>
                         <option>all-open:annotation=jakarta.enterprise.context.ApplicationScoped</option>
+                        <option>all-open:annotation=jakarta.persistence.Entity</option>
                         <option>all-open:annotation=io.quarkus.test.junit.QuarkusTest</option>
                     </pluginOptions>
                 </configuration>