metrics: Refactor LockFreeHistogram and add tests

Stripped down LockFreeHistogram implementation to the minimum, reducing the amount of code. Refactored metrics to use the modularity provided by the histogram refactor.
scylladb · Jan 5, 2025 · 4ffb454 · 4ffb454
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diff --git a/scylla/src/transport/histogram/config.rs b/scylla/src/transport/histogram/config.rs