Metrics info need update

In the last update, we standardized the input parameters of `metric._compute_one` to use names like 'pred_answer' and 'ref_answers', but the corresponding `feature` section in `metric._info()` was not updated accordingly—it still retains the old naming conventions ('answers' and 'gt_answers').

Additionally, in the newer version of the `datasets` package, the `MetricInfo` class has been deprecated and should be replaced with `evaluate.MetricInfo`.

Locate the metric._compute_one and metric._info() definitions and inspect the feature section for the old parameter names. Check the current dependency usage for datasets.MetricInfo versus evaluate.MetricInfo, then update both references and run the relevant metric tests or evaluation checks to confirm the metadata and inputs remain consistent.

Written by the indexing model from the issue text.