Implemented coral blocks

there are some complications with coral plants due to the fact we're stuck with R12 worlds right now - and also coral fans are a major pain to implement due to how messed up the metadata is.

src/data/bedrock/CoralTypeIdMap.php

@@ -0,0 +1,68 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\data\bedrock;
+
+use pocketmine\block\BlockLegacyMetadata;
+use pocketmine\block\utils\CoralType;
+use pocketmine\utils\SingletonTrait;
+use function array_key_exists;
+
+final class CoralTypeIdMap{
+	use SingletonTrait;
+
+	/**
+	 * @var CoralType[]
+	 * @phpstan-var array<int, CoralType>
+	 */
+	private $idToEnum = [];
+	/**
+	 * @var int[]
+	 * @phpstan-var array<int, int>
+	 */
+	private $enumToId = [];
+
+	public function __construct(){
+		$this->register(BlockLegacyMetadata::CORAL_VARIANT_TUBE, CoralType::TUBE());
+		$this->register(BlockLegacyMetadata::CORAL_VARIANT_BRAIN, CoralType::BRAIN());
+		$this->register(BlockLegacyMetadata::CORAL_VARIANT_BUBBLE, CoralType::BUBBLE());
+		$this->register(BlockLegacyMetadata::CORAL_VARIANT_FIRE, CoralType::FIRE());
+		$this->register(BlockLegacyMetadata::CORAL_VARIANT_HORN, CoralType::HORN());
+	}
+
+	public function register(int $id, CoralType $type) : void{
+		$this->idToEnum[$id] = $type;
+		$this->enumToId[$type->id()] = $id;
+	}
+
+	public function fromId(int $id) : ?CoralType{
+		return $this->idToEnum[$id] ?? null;
+	}
+
+	public function toId(CoralType $type) : int{
+		if(!array_key_exists($type->id(), $this->enumToId)){
+			throw new \InvalidArgumentException("Coral type does not have a mapped ID"); //this should never happen
+		}
+		return $this->enumToId[$type->id()];
+	}
+}