Create a `Differ` abstract base class

[lars-reimann]

Is your feature request related to a problem?

We need to define an interface for diff algorithms that match old API elements to new API elements.

Desired solution

Create an abstract base class with an @abstractmethod that describes the diff functionality. Particularly think about its inputs and outputs.

Maybe have separate functions to match classes, attributes, functions, parameters, etc.

Possible alternatives (optional)

No response

Screenshots (optional)

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Additional Context (optional)

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[lars-reimann]

We could also break this down one step further and describe an interface to compute the similarity between two different API elements. It can then return some numeric value and the differ only needs to decide whether the similarity is high enough to consider the two API elements as matching.

[github-actions]

🎉 This issue has been resolved in version 1.69.0 🎉

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