Review and Test Type Hint Simplification in linkability Function

[sourcery-ai]

The linkability function in the audmetric module has undergone a simplification of its type hints for the truth and prediction parameters. While this change aims to improve readability, there is a concern about whether it maintains the same level of type safety and does not alter the function's behavior or expected input types.

Additionally, it has been observed that calling audmetric.linkability(True, True) results in a TypeError with the message: "iteration over a 0-d array". This indicates a potential issue with handling scalar types in the function.

Currently, there are no tests for scalar types in test_linkability, which could help in identifying and resolving this issue.

Action Items:

1. Review the simplification of type hints to ensure type safety and correct behavior.
2. Investigate the TypeError when scalar types are used as inputs.
3. Add tests for scalar types in test_linkability to prevent similar issues in the future.

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I created this issue for @ChristianGeng from #60 (comment).

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As mentioned below, the scope of the MR should be extended:

• scalar values are not intended to be supported. Therefore the type hint should be adapted,
• scalar inputs should thwrow
• _matching_scores has the same problem and should be extended analogously