Use a object as the only parameter of all events.

[huan]

As we have already a ScanStatus now:

https://github.com/wechaty/wechaty-puppet/blob/bf207d3641b014e6f2fe3b94a338ed69330ab32e/src/schemas/event.ts#L4-L13

P.S. Due to the gRPC rules: the enum number 0 should be Unknown. (to be fixed)