事件的全局标识：来自哪个适配器、哪个 bot、哪类事件
Properties
adapter
readonlyadapter:string
bot_id?
readonlyoptionalbot_id?:string
event_type
readonlyevent_type:string
fingerprint?
readonlyoptionalfingerprint?:string
message_id?
readonlyoptionalmessage_id?:string
native_event_id?
readonlyoptionalnative_event_id?:string
source_id?
readonlyoptionalsource_id?:string
timestamp?
readonlyoptionaltimestamp?:number