Add configurable death item drop knockback (#326)

* feat: add configurable death item drop knockback settings

* Add config option xd

leaf-server/src/main/java/org/dreeam/leaf/config/modules/gameplay/DeathItemDropKnockback.java

@@ -0,0 +1,36 @@
+package org.dreeam.leaf.config.modules.gameplay;
+
+import org.dreeam.leaf.config.ConfigModules;
+import org.dreeam.leaf.config.EnumConfigCategory;
+
+public class DeathItemDropKnockback extends ConfigModules {
+
+    public String getBasePath() {
+        return EnumConfigCategory.GAMEPLAY.getBaseKeyName() + ".death-item-drop-knockback";
+    }
+
+    public static boolean dropAround = true;
+    public static double horizontalForce = 0.5;
+    public static double verticalForce = 0.2;
+
+    @Override
+    public void onLoaded() {
+        dropAround = config.getBoolean(getBasePath() + ".drop-around", dropAround,
+            config.pickStringRegionBased(
+                "If true, items will drop randomly around the player on death.",
+                "如果为 “true”，物品会在玩家死亡时随机掉落在其周围."
+            ));
+
+        horizontalForce = config.getDouble(getBasePath() + ".horizontal-force", horizontalForce,
+            config.pickStringRegionBased(
+                "Base speed for horizontal velocity when randomly dropping items.",
+                "随机掉落物品时水平速度的基本速度."
+            ));
+
+        verticalForce = config.getDouble(getBasePath() + ".vertical-force", verticalForce,
+            config.pickStringRegionBased(
+                "Upward motion for randomly dropped items.",
+                "随机掉落物品的向上运动."
+            ));
+    }
+}