Gen Plugin Lifecycle Fn
typealias GenPluginLifecycleFn<TData> = (Fetch<TData>, RequestOptions<TData>) -> PluginLifecycle<TData>
Fetch.pluginImpls 本质是调用GenPluginLifecycleFn函数后保存的PluginLifecycle列表 ,这个函数的入参是Fetch实例与RequestOptions配置。