Add metrics for easier benchmarking and performance monitoring

[tillig]

This adds some metrics to Autofac that can be enabled by setting the environment variable AUTOFAC_METRICS to 1 or true. Doing this will enable counters that indicate how long various things like middleware and operations take as well as information on lock contentions.

The benchmarking project has also been updated to more easily be run so it can compare the current source branch against a baseline version by specifying a released NuGet version of Autofac as a comparison.

[codecov]

Codecov Report

❌ Patch coverage is 48.92704% with 119 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.17%. Comparing base (40d167b) to head (5aaee7b).
⚠️ Report is 16 commits behind head on develop.

Files with missing lines	Patch %	Lines
...atures/Collections/CollectionRegistrationSource.cs	40.90%	10 Missing and 3 partials ⚠️
.../Core/Activators/Reflection/ReflectionActivator.cs	60.00%	6 Missing and 6 partials ⚠️
...Middleware/CircularDependencyDetectorMiddleware.cs	38.88%	8 Missing and 3 partials ⚠️
src/Autofac/Core/Lifetime/LifetimeScope.cs	50.00%	6 Missing and 4 partials ⚠️
...ctivators/Reflection/AutowiringPropertyInjector.cs	38.46%	6 Missing and 2 partials ⚠️
...c/Core/Resolving/Middleware/StartableMiddleware.cs	20.00%	7 Missing and 1 partial ⚠️
...Resolving/Middleware/DisposalTrackingMiddleware.cs	30.00%	6 Missing and 1 partial ⚠️
...e/Resolving/Middleware/ScopeSelectionMiddleware.cs	30.00%	6 Missing and 1 partial ⚠️
...fac/Core/Resolving/Middleware/SharingMiddleware.cs	30.00%	6 Missing and 1 partial ⚠️
...Autofac/Features/Decorators/DecoratorMiddleware.cs	30.00%	6 Missing and 1 partial ⚠️
... and 5 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1477      +/-   ##
===========================================
- Coverage    78.55%   77.17%   -1.39%     
===========================================
  Files          216      216              
  Lines         5604     5782     +178     
  Branches      1209     1240      +31     
===========================================
+ Hits          4402     4462      +60     
- Misses         695      786      +91     
- Partials       507      534      +27     

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