Performance improvements

[tillig]

After adding AnyKey support it seemed like the benchmarks were starting to slip from the last major release. I did some passes through the code to find some performance/maintainability wins to try to claw back some of that perf.

• Performance-focused refactor across resolve pipeline and middleware to reduce per-resolve overhead and trim hot-path allocations.
• Removed several LINQ-based paths in critical resolution/injection flows and replaced them with lower-overhead logic.
• Added and improved caching for AnyKey and adapted AnyKey registrations, including per-scope cache behavior.
• Added support for externally managed reflection caches and expanded reflection cache dictionary handling for keyed services/parameters.
• Optimized reflection activation and keyed service parameter injection to skip unnecessary work when possible.
• Updated benchmark coverage with additional AnyKey scenarios and benchmark-set updates to verify performance impact.
• Included cleanup and stability updates (for example, removing unused usings and reverting temporary audit configuration changes).
• Validation completed with test and benchmark runs during development.

[codecov]

Codecov Report

❌ Patch coverage is 56.95364% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.42%. Comparing base (812f644) to head (7b3a2c8).
⚠️ Report is 14 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../Core/Resolving/Pipeline/ResolvePipelineBuilder.cs	0.00%	48 Missing and 1 partial ⚠️
...Middleware/CircularDependencyDetectorMiddleware.cs	55.55%	2 Missing and 2 partials ⚠️
...til/Cache/ReflectionCacheKeyedServiceDictionary.cs	63.63%	2 Missing and 2 partials ⚠️
src/Autofac/Core/ReflectionCacheSet.cs	87.50%	1 Missing and 1 partial ⚠️
...ing/Middleware/ActivatorErrorHandlingMiddleware.cs	75.00%	1 Missing and 1 partial ⚠️
...Features/KeyedServices/AnyKeyRegistrationSource.cs	84.61%	1 Missing and 1 partial ⚠️
src/Autofac/Core/KeyedServiceParameterInjector.cs	85.71%	0 Missing and 1 partial ⚠️
...c/Core/Resolving/Middleware/StartableMiddleware.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1478      +/-   ##
===========================================
+ Coverage    77.17%   77.42%   +0.25%     
===========================================
  Files          216      217       +1     
  Lines         5782     5802      +20     
  Branches      1240     1250      +10     
===========================================
+ Hits          4462     4492      +30     
+ Misses         786      780       -6     
+ Partials       534      530       -4     

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