add vqa_accuracy and CIDEr

[Kamichanw]

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[Kamichanw]

I implemented two popular metrics VQA accuracy and CIDEr used in visual question answering task and image captioning task. These implementations are strictly aligned with official evaluation pipeline(official VQA accuracy implementation, official CIDEr implementation). The correctness of my implementation can be examined by test scripts I wrote, or visiting my hugging face spaces(VQA accuracy, CIDEr).