Unify preds, target input arg naming across all text metrics

[stancld]

🚀 Enhancement / API / design

Unify preds, target input argument naming across all text metrics.

Metrics:

• bert Unify preds, target input arguments for text metrics [1of2] bert, bleu, chrf, sacre_bleu, wip, wil #723
• bleu Unify preds, target input arguments for text metrics [1of2] bert, bleu, chrf, sacre_bleu, wip, wil #723
• cer Unify preds, target input arguments for text metrics [2of2] cer, ter, wer, mer, rouge, squad #727
• chrf Unify preds, target input arguments for text metrics [1of2] bert, bleu, chrf, sacre_bleu, wip, wil #723
• mer Unify preds, target input arguments for text metrics [2of2] cer, ter, wer, mer, rouge, squad #727
• rouge Unify preds, target input arguments for text metrics [2of2] cer, ter, wer, mer, rouge, squad #727
• sacre_bleu Unify preds, target input arguments for text metrics [1of2] bert, bleu, chrf, sacre_bleu, wip, wil #723
• ter Unify preds, target input arguments for text metrics [2of2] cer, ter, wer, mer, rouge, squad #727
• wer Unify preds, target input arguments for text metrics [2of2] cer, ter, wer, mer, rouge, squad #727
• wip Unify preds, target input arguments for text metrics [1of2] bert, bleu, chrf, sacre_bleu, wip, wil #723
• wil Unify preds, target input arguments for text metrics [1of2] bert, bleu, chrf, sacre_bleu, wip, wil #723
• squad Unify preds, target input arguments for text metrics [2of2] cer, ter, wer, mer, rouge, squad #727

Additional context:

@ashutoshml and I will handle that.

[stancld]

@ashutoshml

[ashutoshml]

@stancld: Sounds good. I'll start working on cer, ter, wer, mer, rouge, squad

[Borda]

great work @stancld @ashutoshml! 🎉

[stancld]

@ashutoshml Thanks a lot for your contribution! O:]