Rename internal CMagicGem implementation

src/main/java/cn/infstar/magicgem/gem/GemUseResult.java

@@ -0,0 +1,9 @@
+package cn.infstar.magicgem.gem;
+
+import org.bukkit.inventory.ItemStack;
+
+public record GemUseResult(boolean consumed, boolean successful, ItemStack target, String message) {
+    public static GemUseResult rejected(ItemStack target, String message) {
+        return new GemUseResult(false, false, target, message);
+    }
+}