Allow the user to pre-select the printed regression metrics

Allow the user to only print the relevant metrics by setting a new metrics input list. This affects functions RegressionAssessment.print_metrics and RegressionAssessment.print_stratified_metrics.

print_metrics update done on commit 9aa14ea6c2b2fb02aab069bdb9e11d1ec1f7175c.
print_stratified_metrics update done on commit cdf6dbb743d89ded61e86b1baebfa7a9b71313e9.

Edited Sep 28, 2021 by Kamila Zdybal

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