AstraRetriever -> AstraEmbeddingRetriever

[anakin87]

Part of #319

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1. The changes are merged in the main branch (Code + Docstrings)
2. The package has been released on PyPI
3. Docs at https://docs.haystack.deepset.ai/ were updated
4. Integration tile on https://github.com/deepset-ai/haystack-integrations was updated
5. Notebooks on https://github.com/deepset-ai/haystack-cookbook were updated (if needed)
6. Tutorials on https://github.com/deepset-ai/haystack-tutorials were updated (if needed)
7. Articles on https://github.com/deepset-ai/haystack-home/tree/main/content were updated (if needed)

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