✨ Feature: Added support for button based cover controls

[wouterdebruijn]

Summary

This PR introduces the is_button variable to the cover configuration. When set to true, this simulates a momentary button press, where the associated switch is temporarily set to a high state, as opposed to flipping a persistent switch.

Rationale

This feature is beneficial for remote-controlled window covers that have been adapted for HomeAssistant integration. These covers typically expect button presses for operation and only stop when a dedicated stop button is pressed. This PR enables the simulation of such button presses, making the integration compatible for these types of setups.

Changes

• Added the is_button configuration option for all covers. It defaults to false to preserve compatibility with existing configurations.
• Utilized asyncio for its sleep functionality to manage timed deactivation.
• Implemented a delay in the _async_handle_command function to turn off the switch after 1 second of activation, simulating a button press. This is only enabled for covers where is_button is set to true.