Add support for Rain Sensor toggle (onRainDelay) for GOAT models

[monsivar]

Checks

• I have read the above text and I'm aware of the situation
• I have searched the existing issues and no issue is describing my issue
• I have installed the latest version

The feature you want to suggest

Hi everyone,

I've been running the deebot-client locally in debug mode to map out some missing functionalities for my Ecovacs Goat O1200 (class 2i0fns).

I noticed that the library currently throws an Unknown message error when toggling the Rain Sensor on and off in the official app.

Here are the raw MQTT payloads I captured. It looks like the setting is controlled and reported via the onRainDelay topic. It also triggers a tracking event on onFwBuryPoint-bd_setting-evt.

1. Turning Rain Sensor OFF:

topic=iot/atr/onRainDelay/3f52d7d8-0394-483b-adce-df9b50bddc11/2i0fns/L3arM3zU/j
payload={"header":{"tzm":120,"ts":"1780091030053428514","fwVer":"1.8.18"},"body":{"data":{"enable":0,"delay":180}}}

(The tracking event that fired simultaneously):

`topic=iot/atr/onFwBuryPoint-bd_setting-evt/3f52d7d8-0394-483b-adce-df9b50bddc11/2i0fns/L3arM3zU/j
payload={"header":{"tzm":120,"ts":"1780091030054193055","fwVer":"1.8.18"},"body":{"gid":"G1779554483971","index":"0000063860","new":{"RainDetect":0},"orig":{"RainDetect":1},"tigger":1,"ts":"1780091030041"}}`

2. Turning Rain Sensor ON:
`topic=iot/atr/onRainDelay/3f52d7d8-0394-483b-adce-df9b50bddc11/2i0fns/L3arM3zU/j
payload={"header":{"tzm":120,"ts":"1780091046002834979","fwVer":"1.8.18"},"body":{"data":{"enable":1,"delay":180}}}`

Request:
It would be awesome if onRainDelay could be parsed so this feature could be exposed as a switch/toggle in Home Assistant. The delay value seems to default to 180 minutes.

Let me know if you need any additional tests or payloads for other GOAT-specific toggles (like Animal Protection, Edge cuts, etc.), and I'll gladly pull them!