Feat/metrics precision recall

[LinasKo]

Description

Added Precision and Recall metrics.
Added missing documentation and examples for other metrics. Added
Added Common Values section, documenting metric enums.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How has this change been tested, please provide a testcase or example of how you tested the change?

Colab

Any specific deployment considerations

Docs

• Docs updated? Yes.

[LinasKo]

Note: the mAP values in the Colab are very suspicious. Treating missing values as 0 might be having an impact after all.

[LinasKo]

I verified that Precision and Recall values make up the F1 score. The plotting looks alright.

There are a few runtime warnings when averaging the results with MICRO and WEIGHTED, but the results is correct. Let's leave that for the future.