The stats interface has an implementation in the interface itself and another inside the PackExtBlockCache class. This asymmetry gets on the way to implement stats-per-table later.
Make DfsBlockCacheStats (the stats of a single table) a top-level class and create an aggregator class to combine multiple stats. This makes the stats classes mirror the table classes structure (singles tables + composite).
This change is part of a refactor to support providing detailed stats
breakdowns for cache implementations using multiple table instances
while keeping the existing "aggregated" view of cache stats.
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