Visualize ball placement point in Thunderscope field widget

[williamckha]

Description of the task

The ball placement point should be visualized in the Thunderscope field widget. Implementation in #3282

The implementation work is mostly done, so this issue is mainly for porting over these changes to our master branch + cleaning up the code. Read through the linked PR and try running the code on your machine.

Acceptance criteria

• [ ] Add a "Referee" layer to the field widget and visualize the ball placement point in the layer
• [ ] Visualization should include a circle centered at the ball placement point with a radius of 0.15 m representing the allowed tolerance for ball placement
• [ ] Circle should be shaded green/red depending on whether the ball is in the placement zone or not
• [ ] Test by sending Game Controller commands

Blocked By