Create a cone detector and local planner to navigate around cones

[Ezward]

1. Create a cone detector. This can be based on the stop sign detector (see Issue Update stop sign detector to run without EdgeTPU #953). We may need to do some transfer learning to add more cones to the dataset. We only care about the cone category.

• Cone Detection Dataset

2. In path follow template, create a local planner that will modify the robot's path to avoid a cone detected by the cone detector.

[Ahrovan]

for 1_I think it's better to use Yolo. I am working on a sample. Please try to send me a set of images so that I can prepare the model.

[cfox570]

See Pull Request StopSign and Cone Detection #1131
I used TensorFlow Lite Object Detection with a custom cone model to implement traffic cone avoidance. It was tested with Raspberry Pi 4. I am adding a pull request for the docs Create object_detection.md #51