Blacklist manager refactor & New in-memory cache

[deepsource-io[bot]]

Here's the code health analysis summary for commits 84ef080..a53b3d3. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	❌ Failure	❗ 43 occurences introduced 🎯 16 occurences resolved	View Check ↗

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