Allow passing external lru cache instance.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.68%. Comparing base (ef5d7cc) to head (7feacd8).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/CachedResolver.js	50.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
- Coverage   78.33%   77.68%   -0.66%     
==========================================
  Files           4        4              
  Lines         337      345       +8     
==========================================
+ Hits          264      268       +4     
- Misses         73       77       +4     

Files with missing lines	Coverage Δ
lib/CachedResolver.js	62.24% <50.00%> (-1.09%)	⬇️

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