[Feature Request] The ability to set custom "no mail" images for each carrier that supports the camera entity

[Casuallynoted]

Is your feature request related to a problem? Please describe.
At the moment, you can set a custom no mail image- which is great! But it also only allows you to use one image that is shared across all created camera mail entities, which makes adding cool custom images like this per carrier:

really difficult ;_;

Describe the solution you'd like
I'd like the ability to set images per carrier, so that way each camera can have a unique no mail image.

Describe alternatives you've considered
I'm not sure if there are any alternatives that offer the same outcome.

Additional context
This integration is awesome, thank you for making it! (Also atm the integration doesn't start if I have amazon enabled but not sure if that's already a known bug.

[github-actions]

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[Casuallynoted]

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