Add exact match metric
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2022-03-11T22:28:42Z
https://github.com/huggingface/datasets/pull/3899#issuecomment-1065595576
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2022-03-21T16:10:03Z
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Adding the exact match metric and its metric card.

Note: Some of the tests have failed, but I wanted to make a PR anyway so that the rest of the code can be reviewed if anyone has time. I'll look into + work on fixing the failed tests when I'm back online after the weekend