Add sub-entities for Smart Water Fountain Model S4

[jayanezj]

Device model / 设备型号

mmgg.pet_waterer.s4

Component version / 插件版本

0.7.17

HA core version / HA版本

2024.3.3

Integrated mode / 集成方式

Automatic (自动模式)

The problem / 问题详情

The S4 model of the Smart Pet Fountain does not have sub-entities as do the S1 and Wi11 models, I have created a Pull Request to add the sub-entities.

The lid-up subentity has not been added because this model does not support it (checked with miiot speec and with my own S4 running).

Entity attributes / 实体属性

Not needed.

Home Assistant Logs / 系统日志

Not needed.