Add Reset Frontend Cache Notification Command

**Is your feature request related to a problem? Please describe.**

When an update requires a frontend cache reset (such as a HACS module update, such as card-mod), I have to physically visit and manually reset the frontend cache on every Android device that I have running the HA Companion App. I currently have 5 Android devices and will eventually add more. Running some devices in kiosk mode also makes this task more involved.

**Describe the solution you'd like**

To be able to send a Notification Command, perhaps through an automation, to each device's Companion App that will trigger a frontend cache reset similar to the recently added command on the Companion App's Troubleshooting page.

**Describe alternatives you've considered, if any**

None, but will try any suggestions offered.

**Additional context**

None.

Thanks for you consideration and help.