Update COCO export

[nathanielrindlaub]

rename image.original_relative_path to image.file_name (not sure where I got 'original_relative_path' from but it's out of spec)

COCO for CameraTraps spec: https://github.com/microsoft/CameraTraps/tree/main/data_management COCO spec: https://cocodataset.org/#format-data

[nathanielrindlaub]

Also consider restructuring both data download path and file path? Perhaps include deployment in there (something like <camera>/<deployment>/<file>.jpg?

[nathanielrindlaub]

In COCO export, make the following changes:

• [x] remove image.original_relative_path field
• [x] use <projectId>/<cameraId>/<deployment_name_normalized>/<image_id>.<image_extension> as the template for image.file_name (this will be the local destination path when images are downloaded).*
• [x] include image.originalFileName field
• [x] include an image.serving_bucket_key field

* Note: not sure how this would work on windows (i.e. won't the forward slashes not play well with windows file system?)