Support for G4 Doorbell Pro
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**Is your feature request related to a problem? Please describe:**
The G4 Doorbell Pro has now been released and it would be good to see what support can be added for the additional package camera.

**Describe the solution you'd like:**
To add a stream for the package camera, or, if HomeKit has a way to have this exposed as part of the doorbell as a secondary camera to do that.

**Describe alternatives you've considered:**
As this is a new feature, I do not see any alternatives.

**Additional context:**
[Unifi doorbell page](https://ui.com/camera-security/doorbell)

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