Add device trigger support to the water_heater integration

[balloob]

Add device trigger support to the water_heater integration.

Device triggers are part of Device Automations, a new concept that was recently launched to make automations more user friendly.

Device automations consist of three different parts: triggers, triggers and triggers. This issue is about the trigger part.

To get started with this issue, you will need to set up a Home Assistant development environment. The easiest approach is to get started using a dev container.

Once you have a development environment set up, run the following and follow the instructions:

python3 -m script.scaffold device_trigger

(This issue is part of #27008)

[github-actions]

There hasn't been any activity on this issue recently. Due to the high number of incoming GitHub notifications, we have to clean some of the old issues, as many of them have already been resolved with the latest updates.
Please make sure to update to the latest Home Assistant version and check if that solves the issue. Let us know if that works for you by adding a comment 👍
This issue has now been marked as stale and will be closed if no further activity occurs. Thank you for your contributions.