feat: add mcping and help command

src/main/kotlin/cn/rtast/fancybot/entity/MCPingResponse.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/9/3
+ */
+
+
+package cn.rtast.fancybot.entity
+
+data class MCPingResponse(
+    val version: Version,
+    val players: Players,
+    val favicon: String
+) {
+    data class Version(
+        val protocol: Int,
+        val name: String,
+    )
+
+    data class Players(
+        val online: Int,
+        val max: Int,
+    )
+}