sava image_path in target of coco annotation data

[developer0hye]

The current version only saves the image_id into the target, making it difficult to identify the image intuitively. To address this, I've added image_path to the target, which provides intuitive information and makes debugging easier for users during development.

[pytorch-bot]

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[AntoineSimoulin]

Hey @developer0hye, thank you for submitting this PR! Your proposal looks great, but I suspect that most users may not require this information frequently. I would prefer to let users to reconstruct this information on a per-needed basis using the root dataset attribute and path = self.coco.loadImgs(id)[0]["file_name"] as you proposed. If you have a local version of the codebase that works well for you, I am inclined not to merge this PR at the moment.
Please feel free to share any additional thoughts or insights you might have.
Best,
Antoine

[developer0hye]

@AntoineSimoulin Thank you for your review! I agree with you.