License/Upstream to ESPHome about amg8833-esphome

[TheRealWaldo]

I've just pushed the work towards converting this into an external component so far to https://github.com/TheRealWaldo/AMG8833-ESPHOME/tree/external_component

There are a few things that I still need to complete.

I want to figure out if it's okay to immediately publish the state from the sensors rather than wait for polling, and this would be best for both the camera and person detection. I think it's as simple as adding the publish in the loop instead of the update, but I need to experiment and confirm if there is any precedent to doing that.

If not, I'll have to do some refactoring to break those sensors into individual classes.

The text_sensor I'm using for the camera needs some love, as does the root sensor component.

Lastly, I've got to port the library in since ESPHome does not allow for external libraries.

[TheRealWaldo]

@brotherdust definitely interested in getting the AMG8833 and a few other sensors into ESPHome, and I have been wanting to do so and did start a project for it; would be happy to work with you to do get it working!