Display device name in bluetooth panel

[piitaya]

Proposed change

If a bluetooth device is connected to HA, display the device name. Also, the source will use the device name if available.
It will be easier to find which bluetooth proxy is linked to each bluetooth device.

I also added grouping per source (by default and it can be displayed)

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io