[ENH] Replace prts metrics

[aryanpola]

Reference Issues/PRs

Addresses #2066

What does this implement/fix? Explain your changes.

Implementation of Precision, Recall and F1-score metrics.

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[MatthewMiddlehurst]

Some of these functions look like they should be private/protected. In the tests please run both the new and current functions to ensure the output is the same (using pytest)

[aryanpola]

Changes made from the previous commit:

1. Added a function for flattening lists of lists into a list.
2. Removes overlapping functions.
3. Changed the metric calculations from averaging(w.r.t cardinality) to global(w.r.t overlapping positions) calculation of real and pred ranges.

[aryanpola]

@MatthewMiddlehurst Please let me know if the test cases are fine, I can separate them into different functions if necessary.

[TonyBagnall]

thanks for this, its really helpful. We will look again next week