feat: show bluetooth connected devices

[yanganto]

Show connected bluetooth devices.

• If only one bluetooth device, it will show icon with device name.
• If more than one bluetooth devices, it will only show icons for these devices.
• If no connected devices, then use bold/normal bluetooth font to show the power on/off status of bluetooth.

[faervan]

That looks awesome! Is there a reason for why Device and Controllor are public?

[faervan]

Mostly minor things, partially because I wanted to test how reviewing works on github 😆
The only thing that I really want to get changed is the font of the device name, that really stands out

[yanganto]

Thanks for the review. Bar-rs is daily used in my end, and I like this project.
If it is good, I will put the bluetooth setting feature on it, but it may take a longer time,

[faervan]

Beautiful, thanks a lot for this PR :)

[yanganto]

Thanks for your project, it is simple, awesome, good for daily use.