feat: add mcping and help command

src/main/kotlin/cn/rtast/fancybot/commands/HelpCommand.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/9/3
+ */
+
+
+package cn.rtast.fancybot.commands
+
+import cn.rtast.fancybot.commands
+import cn.rtast.rob.entity.GroupMessage
+import cn.rtast.rob.util.BaseCommand
+import cn.rtast.rob.util.ob.MessageChain
+import cn.rtast.rob.util.ob.OBMessage
+
+class HelpCommand : BaseCommand() {
+    override val commandNames = listOf("/help", "/帮助")
+
+    override suspend fun executeGroup(listener: OBMessage, message: GroupMessage, args: List<String>) {
+        val allCommands = commands.joinToString("\n") {
+            "[${it.javaClass.name.split(".").last().replace("Command", "")}] 命令:${it.commandNames.joinToString(",")}"
+        }
+        val msg = MessageChain.Builder()
+            .addAt(message.sender.userId)
+            .addNewLine()
+            .addText(allCommands)
+            .build()
+        listener.sendGroupMessage(message.groupId, msg)
+    }
+}