Computer vision for drone tins

[cbrxyz]

What needs to change?

Similar to #1268, we will need to develop a computer vision model to detect the red, green, and blue tins that lay on the drone landing pads. To the down camera, these will look like red, green, and blue circles. We will be using the drone camera's built-in vision model at first, and if this does not perform well, then we will develop our own in-house model.

How would this task be tested?

1. Ensure that the tins are detected in a wide variety of environmental conditions.