LRUCacheInterface lacks of virtual destructor

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Describe the bug (描述bug)
LRUCacheInterface lacks of virtual destructor， for a base class， virtual destructor is must-have.
otherwise, it will lead to memory or resource leaking in derived class.

A common guideline is that a destructor for a base class must be either public and virtual or protected and nonvirtual.

To Reproduce (复现方法)

Expected behavior (期望行为)

Versions (各种版本)
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branch: master
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Additional context/screenshots (更多上下文/截图)