`pop-count`: rename to `eliuds-eggs`

[ErikSchierboom]

We are renaming the pop-count exercise to eliuds-eggs. See https://github.com/exercism/problem-specifications/pull/2382 for more information.

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This PR renames pop-count to eliuds-eggs. We have attempted to rename everything that is automatable, but you may need to make specific changes in the files.

If you could prioritise finishing and merging this, we would be grateful, so we can get the exercise in the correct state across Exercism. Please let me know if you have any questions.

Thanks! 🙂

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[jiegillet]

Thanks for reviewing @angelikatyborska. I made so many mistakes working on this, I had no confidence 😅