add plugin:pack command and pack events

src/ZM/Plugin/Traits/PluginPackTrait.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZM\Plugin\Traits;
+
+trait PluginPackTrait
+{
+    protected mixed $on_pack = null;
+
+    protected mixed $on_pack_filter = null;
+
+    /**
+     * 设置插件被打包前执行的回调函数
+     *
+     * @param callable $callback 回调函数
+     * @return void
+     */
+    public function onPack(callable $callback): void
+    {
+        $this->on_pack = $callback;
+    }
+
+    public function filterPack(callable $callback): void
+    {
+        $this->on_pack_filter = $callback;
+    }
+
+    /**
+     * @internal
+     */
+    public function emitPack(): void
+    {
+        if (is_callable($this->on_pack)) {
+            ($this->on_pack)();
+        }
+    }
+
+    /**
+     * @internal
+     * @param  string $file 文件名称，由 PluginManager 传入
+     * @return bool   返回 False 代表该文件不需要打包
+     */
+    public function emitFilterPack(string $file): bool
+    {
+        if (is_callable($this->on_pack_filter)) {
+            return (bool) ($this->on_pack_filter)($file);
+        }
+        return true;
+    }
+}