feat: ✨ 支持提前解析含content字段的type为forward类型的消息

[kagg886]

在提出此拉取请求时，我确认了以下几点（请复选框）：

• 我已阅读并理解贡献文档。
• 我已检查没有与此请求重复的 Pull Requests。
• 我已经考虑过，并确认这份呈件对其他人很有价值。
• 我接受此提交可能不会被使用，并根据维护人员的意愿关闭 Pull Requests。

填写PR内容：
我的Napcat上总会爆合并转发错误：

2024-11-12 21:42:22.594 [DefaultDispatcher-worker-3] WARN  top.mrxiaom.overflow.OverflowAPI - 解析消息 forward -> {"id":"7436387625315107617","content":[{"self_id":3405637452,"user_id":485184047,"time":1731415740,"message_id":315011686,"message_seq":315011686,"real_id":315011686,"message_type":"group","sender":{"user_id":485184047,"nickname":"上亦下心","card":""},"raw_message":"1","font":14,"sub_type":"normal","message":[{"type":"text","data":{"text":"1"}}],"message_format":"array","post_type":"message","group_id":284840486},{"self_id":3405637452,"user_id":485184047,"time":1731415746,"message_id":1377545730,"message_seq":1377545730,"real_id":1377545730,"message_type":"group","sender":{"user_id":485184047,"nickname":"上亦下心","card":""},"raw_message":"1","font":14,"sub_type":"normal","message":[{"type":"text","data":{"text":"1"}}],"message_format":"array","post_type":"message","group_id":284840486}]} 时出现错误 (NapCat.Onebot v2.6.27)
java.lang.IllegalStateException: 无法下载转发消息，详见网络日志 (logs/onebot/*.log
	at top.mrxiaom.overflow.internal.Overflow.downloadForwardMessage(Overflow.kt:439)
	at top.mrxiaom.overflow.internal.Overflow$downloadForwardMessage$1.invokeSuspend(Overflow.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.internal.ScopeCoroutine.afterResume(Scopes.kt:28)
	at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:99)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:102)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:111)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:99)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:584)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:811)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:715)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:702)

经调试很可能是napcat对get_forward_msg的请求不返回的缘故(至少我查遍napcat的文件日志也未发现napcat向overflow推送get_forward_msg的返回)

而napcat是在type为forward的消息内提前塞了content的。这意味着可以通过提前解析来抑制本该解析失败的消息。

需要注意的是，若含有reply等消息，此时的Overflow仍会发送get_msg请求，目前也未发现get_msg的返回
对于这种方式，我无能为力