chore:

- Opened ContinentGenerator.deriveContinentSeed to the package

Ref.: https://github.com/VolmitSoftware/Iris/issues/1251

core/src/main/java/art/arcane/iris/generation/terrain/ContinentGenerator.java

@@ -18,7 +18,7 @@ public final class ContinentGenerator {
         return dimension.getContinentalStyle().create(deriveContinentSeed(parentSeedSource), packData);
     }
 
-    private static RNG deriveContinentSeed(RNG parentSeedSource) {
+    static RNG deriveContinentSeed(RNG parentSeedSource) {
         return parentSeedSource.nextParallelRNG(CONTINENT_SEED_SALT);
     }