[Feature]: expose serial-numbers for devices

[aebgit]

Requested feature

Exposing the serial-number would improve testing of the Addon in AppleHome.

There are iOS tools that allow backing-up an AppleHome / HomeKit configuration (eg. https://apps.apple.com/de/app/home-6/id995994352). Home+ 6 seems to use the serial-number of a device as a unique identifier, to restore its configuration in AppleHome. The HomeAssistant HomeKit Device integration uses the Entity ID as serial-number.
Restoring the configuration of each Matter-device in AppleHome is quite an effort when done manually (rename devices, move to rooms, add to scenes, add to automations, configure notifications..).
Currently, in the alpha-state of this Addon it happens quite frequently that devices are re-discovered in AppleHome, eg. when the Addon has to be re-paired. If we could just restore a backup, such instabilities or breaking changes would have less impact. I assume that also a migration from HomeKit Device integration to Home-Assistant-Matter-Hub could be achieved this way.

Ideally, all meta-data should be exposed for a complete experience:

• Vendor
• SerialNumber
• Model
• Firmware

Documentation & Issues

• I have reviewed the list of currently supported entities and their limitations.
• I have searched the issues for a similar requests.
• I have checked if my controller is known to support the requested device type.

[aebgit]

Unfortunately it is not working as intended. I have deleted my old Bridge, created a nee one and paired HAMH from scratch with Apple Home, but Serial Numbers are still 'Unknown'.