add slab_mode

[bug-superman]

Use a memory friendly slab-based expiration algorithm to evict expired keys more efficient！ (the performance comparison test: https://p5wr7m1ma3.feishu.cn/docx/doxcnpz0w2sg52Az61bRFEGlPqg)

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (develop@c12fc9c). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #38   +/-   ##
==========================================
  Coverage           ?   69.56%           
==========================================
  Files              ?        7           
  Lines              ?     3138           
  Branches           ?        0           
==========================================
  Hits               ?     2183           
  Misses             ?      955           
  Partials           ?        0           

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[chenyang8094]

另外，你需要在.github里的workflows里加一下slab model的测试，否则目前的CI覆盖不了你的代码

[chenyang8094]

编译警告解决下