Add BlockExplosionHitEvent (#349)

* Add BlockExplosionHitEvent

* Remove import

leaf-api/src/main/java/org/dreeam/leaf/event/BlockExplosionHitEvent.java

@@ -0,0 +1,63 @@
+package org.dreeam.leaf.event;
+
+import org.bukkit.ExplosionResult;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.block.BlockEvent;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Called when a block executes its explosion hit actions.
+ * If the event is cancelled, the block will not execute the explosion hit actions.
+ */
+public class BlockExplosionHitEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled;
+    private final Entity source;
+    private final ExplosionResult result;
+
+    public BlockExplosionHitEvent(@NotNull Block block, Entity source, ExplosionResult result) {
+        super(block);
+        this.source = source;
+        this.result = result;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    /**
+     * Returns the entity responsible for the explosion.
+     *
+     * @return Entity responsible for the explosion
+     */
+    public Entity getSource() {
+        return source;
+    }
+
+    /**
+     * Returns the result of the explosion.
+     *
+     * @return the result of the explosion
+     */
+    public ExplosionResult getResult() {
+        return result;
+    }
+}