Added new MSE Similarity Evaluator #2704
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The class EmbeddingSimilarityEvaluator is suited to score-labeled sentence pairs. It calculates Spearman and Pearson correlations between embedding similarities and gold labels. I added a new class MSESimilarityEvaluator to be able evaluate the model with the MSE metric between embedding similarities and gold labels. It is different from MSEEvaluator, as that one computes MSE between teacher and student embedding while MSESimilarityEvaluator computes MSE between the gold and embedding similarities.