Add keilerkonzept/topk

[sgreben]

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• [X] forge link (github.com, gitlab.com, etc): https://github.com/keilerkonzept/topk
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Thanks for your PR, you're awesome! :sunglasses:

[github-actions[bot]]

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[sgreben]

In terms of relevance for inclusion:

The only other high-quality top-k sketch package for Go - https://github.com/segmentio/topk - does not implement the sliding-window variant of HeavyKeeper (while keilerkonzept/topk does).

Currently, segmentio/topk is not being maintained (see the note in their repo). As a result, it's missing a few optimizations and so the non-sliding sketch in keilerkonzept/topk is also generally faster than the one in segmentio/topk.

[sgreben]

the actual link in the README.md was missing the URI scheme 😅 Here's a follow-up PR #5417 with the fix..