[Core][WIP] Add Automatic Prefix Caching to PrefixCachingBlockAllocator #4146
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This PR adds support for automatic prefix caching to PrefixCachingBlockAllocator, which is used by BlockAllocatorV2 when "enable_caching" is set to true. The eviction policy implemented here should be identical to the existing LRU eviction policy that's used by BlockAllocatorV1.