Draft: Add consistent hashing library
What does this MR do and why?
Closes #392335
Adds a consistent hashing library for GitLab. The IndexNamingService
introduced in this MR that uses the hashing library can be used in the future for a naming convention that assigns specific Advanced Search indices to a namespace or project. Ideally IndexNamingService
could be used for both Elasticsearch indices and Zoekt indices.
This is currently experimental and is part of this epic: #391516
This implementation is inspired by this proof of concept: !111811 (closed)
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