Implement mobile hotspot sync

- This turns on mobile hotspot from [crowncrate-android](https://github.com/Crown-OS/crowncrate-android).
- It connects to the mobile hotspot from [crowncrate-linux](https://github.com/Crown-OS/crowncrate-linux).
- This should use the bluetooth ble connection to trigger.
- User can enable it from [crownbar](https://github.com/Crown-OS/crownbar).