39 lru replace stdlist with intrusive list for better cache locality

[jsrivaya]

Description

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Performance improvement
• Code refactoring (no functional changes)

Checklist

• My code follows the project's coding standards
• I have run make check-format and fixed any issues
• I have added tests that prove my fix/feature works
• All new and existing tests pass (make build)
• I have updated documentation if needed
• My changes generate no new warnings

Performance Impact

N/A

Additional Notes

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 95.08197% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.49%. Comparing base (b6462de) to head (d5ed607).

Files with missing lines	Patch %	Lines
include/loon/lru.hpp	94.33%	1 Missing and 2 partials ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
- Coverage   98.31%   97.49%   -0.83%     
==========================================
  Files           8        8              
  Lines         237      279      +42     
  Branches       35       41       +6     
==========================================
+ Hits          233      272      +39     
- Misses          0        1       +1     
- Partials        4        6       +2     

Files with missing lines	Coverage Δ
test/test_lru.cpp	100.00% <100.00%> (ø)
include/loon/lru.hpp	95.08% <94.33%> (-4.92%)	⬇️

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