add water level

[pkoehlers]

Add a drop down menu for the water level.

Continuation / Rebase of #304

[github-actions]

This PR is stale because there hasn't been any activity for a long time.

[rammium]

Please continue integrating this feature, it is very useful.

[DAVIDMARTINEZROBLES]

You can use the shorcuts

shortcuts:
  - name: Water level Off
    service: select.select_option
    service_data:
      entity_id: select.roborock_q7_max_mop_intensity
      option: 'off'
    icon: mdi:numeric-0
  - name: Uso de agua minimo
    service: select.select_option
    service_data:
      entity_id: select.roborock_q7_max_mop_intensity
      option: low
    icon: mdi:numeric-1

[jrbenito]

Instead of a water level specific drop down menu, why not add the option of a generic drop down menu that could be used to select water level, clean level, etc... That way one can customize to their available options.

For instance, the S8 ultra pro has the water level (mop intensity) and mop level.