#373 add page size event to pagination component

[peterugah]

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Description

In this pull request, I added the ability for the Pagination component to pass the on size changed event as a prop that can be listened for. This is required to correctly compute pagination when pagination is handled in a controlled manner.

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✅ peterugah
❌ ZOPEUGAH

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[FlorianRappl]

LGTM!

(Except that little thing with the new line)