refactor: impl Clone for config for simplification

[MrCroxx]

What's changed and what's your intention?

Please explain IN DETAIL what the changes are in this PR and why they are needed. :D

As title.

Checklist

• I have written the necessary rustdoc comments
• I have added the necessary unit tests and integration tests
• I have passed make all (or make fast instead if the old tests are not modified) in my local environment.

Related issues or PRs (optional)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.11%. Comparing base (bd3fc1a) to head (899fc01).

Files	Patch %	Lines
foyer-memory/src/eviction/lru.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #293   +/-   ##
=======================================
  Coverage   77.11%   77.11%           
=======================================
  Files          61       61           
  Lines        7478     7478           
=======================================
  Hits         5767     5767           
  Misses       1711     1711           

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