Add optional workaround for >Y128 Nether building (#615)

* Add optional workaround for >Y128 Nether building

This commit adds a config option for building above the Nether by changing the Nether's dimension ID to match the End's.

* Only check for workaround application once

* Fix mappings?

* Include a bit more for the above bedrock nether building config option

Co-authored-by: Redned <redned235@gmail.com>

bootstrap/sponge/src/main/java/org/geysermc/platform/sponge/GeyserSpongeConfiguration.java

@@ -124,6 +124,11 @@ public class GeyserSpongeConfiguration implements GeyserConfiguration {
         return node.getNode("cache-chunks").getBoolean(false);
     }
 
+    @Override
+    public boolean isAboveBedrockNetherBuilding() {
+        return node.getNode("above-bedrock-nether-building").getBoolean(false);
+    }
+
     @Override
     public SpongeMetricsInfo getMetrics() {
         return metricsInfo;