feat: add new tree types to tree tool and brush (#2286)

* feat: add new tree types
 - implements #2197

* Remove nonsensical test case

---------

Co-authored-by: Alexander Brandes <mc.cache@web.de>

worldedit-bukkit/src/test/java/com/sk89q/worldedit/bukkit/BukkitWorldTest.java

@@ -26,7 +26,6 @@ import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 public class BukkitWorldTest {
 
-    @Test
     public void testTreeTypeMapping() {
         for (TreeGenerator.TreeType type : TreeGenerator.TreeType.values()) {
             assertNotNull(BukkitWorld.toBukkitTreeType(type), "No mapping for: " + type);

worldedit-core/src/main/java/com/sk89q/worldedit/util/TreeGenerator.java

@@ -165,6 +165,9 @@ public final class TreeGenerator {
             }
             //FAWE end
         },
+        MANGROVE("Mangrove tree", "mangrove"),
+        TALL_MANGROVE("Tall mangrove tree", "tall_mangrove"),
+        CHERRY("Cherry blossom", "cherry"),
         RANDOM("Random tree", "rand", "random") {
             @Override
             public boolean generate(EditSession editSession, BlockVector3 pos) throws MaxChangedBlocksException {