Subcommand to compute all the metrics

I would like to create an option to print all metrics (only the F1-score to keep it simple) for a given dataset.

ie-eval all --label-dir labels/ --prediction-dir predictions/

| Category | ECER (%) | EWER (%) | Nerval (%) |BoW-F1 (%) | BoTW-F1 (%) | BoE-F1 (%) | N documents |
|:--------:|:--------:|:--------:|:----------:|:---------:|:-----------:|:----------:|:-----------:|
|  total   |  13.24   | 25.64    | 69.55      |   71.43   |  77.06      |   80.73    |      5      |