Add support for multiple cookers

[licheng5625]

I saw the way to call cooking start/stop. There is no place to point to specific the entity id , so I assume it does not work with multiple cookers ?

Thank you

[syssi]

You are right. The service implementation is too basic and must be improved.

[tieppm]

@licheng5625 you user model cooker xiaomi?

[lawsongsong]

请问 @syssi 怎么设备多设备，我有两个电饭煲。。。