http-api: add world region to World

Add a WorldRegion to convert from location id to region

Co-authored-by: melkypie <melkypie@users.noreply.github.com>

http-service/src/test/java/net/runelite/http/service/worlds/WorldsServiceTest.java

@@ -77,6 +77,11 @@ public class WorldsServiceTest
 		World world = worldResult.findWorld(385);
 		assertNotNull(world);
 		assertTrue(world.getTypes().contains(WorldType.SKILL_TOTAL));
+
+		for (World testWorld : worldResult.getWorlds())
+		{
+			assertNotNull("Missing a region in WorldRegion enum", testWorld.getRegion());
+		}
 	}
 
 }