Add delay_on/delay_off Fields to Template Sensors in UI

[ciux23]

Description
Currently, binary_sensor templates configured via the UI do not support the delay_on and delay_off options, which are available in YAML configuration.
It would be very useful to have dedicated delay fields directly in the graphical interface to avoid manually editing the YAML file.

Use Case
Example: Monitoring a washing machine with power fluctuations.
With delay_on: Avoid false positives if power consumption exceeds 3W for less than 2 minutes.
With delay_off: Confirm shutdown only after 3 minutes of inactivity.

Notes
This feature is already supported in YAML but is missing in the UI.

Suggested Labels:

• feature-request
• frontend
• template-sensor