Let the experimental gameplay come back And join the java version

Why should I return the experimental gameplay and add the java version，Previously, mojang deleted the experimental gameplay of caves and cliffs in the bedrock version, and changed it to an updated content of caves and cliffs that directly create the world. The java version snapshot needs to create a world. If the world is still the 1.17 official version content, the version must be switched. Adding an experimental gameplay allows us to save this step. The official version server can also be started in the snapshot.