Expose manually-run Mi Home scenes to HomeKit
**Describe the idea or improvement**
I have a couple of manual scenes (where we tap to launch manually) to trigger an action or device. Would be nice to have those manual scenes exposed as a switch in Apple Home as well. Other IoT providers like Tuya plugins made this possible by exposing one-time scenes already created in the app as a switch on the Apple Home app.

**Describe the solution you'd like**
This is useful because some devices on Mi Home app uses custom controls and connectivity that is simply not possible with this plugin yet (like turning on a Projector, IR controls, etc). Best example is with the Tuya plugins which while does not support a pet feeder yet, can still be triggered with a scene that was first created in the Tuya app. The plugin simply exposed the manual scene to Apple Home as a switch, that can be triggered manually or as part of an automation.

**Benefits**
This pretty much simplifies the use of device features that are not exposed by this plugin by default (like we have to add the action trigger manually etc).