refactor: 重构handler系统

model/handler.go

@@ -0,0 +1,12 @@
+package model
+
+import "git.lxtend.com/qqbot/constants"
+
+type Handler func(msg Message) (reply Reply)
+type TryCatchHandler func(msg Message) (reply Reply, catched bool)
+
+type HandlerInfo[H Handler | TryCatchHandler] struct {
+	Trigger string
+	Handler H
+	Level   constants.PermissionLevel
+}