[nest] Support Nest Protect through native Nest API

[jlaur]

With WWN gone and Nest Protect not supported by SDM, that leaves smoke alarms offline from the perspective of openHAB, and thus the capability to integrate with ventilation systems, ovens, lightning etc.

Other projects managed to implement the Nest API used by the Nest app:

• https://github.com/chrisjshull/homebridge-nest
• https://github.com/iMicknl/ha-nest-protect/

I'm not yet into the details, but I did so far manage to get a token by following these instructions: https://github.com/chrisjshull/homebridge-nest#using-a-google-account

Continuation of #14761

[jaywiseman1971]

Following, have 8 NEST Protects that I would like to get working again with OH3.x

Best, Jay