Implement Entity Error Rates (ECER/EWER) and Precision/Recall/F1 score computation on sequences of tags

From the output of the BIO parser, compute the ECER and EWER scores (https://link.springer.com/chapter/10.1007/978-3-031-06555-2_38) on blocks of Named Entities and the Precision/Recall/F1 scores (https://link.springer.com/chapter/10.1007/978-3-031-41682-8_1) on the tagging of the words as an edit distance.

Requires: complete implementation of the BIO parser