feat: allow defining registered open-generic handler-types

[alsami]

• Expose MediatRConfiguration and MediatRConfigurationBuilder as a new way to build the MediatR configuration
• Add new extension that takes an instance of MediatRConfiguration as a parameter
• Allow automatic registration to be disabled using MediatRConfiguration. Closes #10
• Add tests
• Update changelog
• Raise version

[codecov[bot]]

Codecov Report

Merging #11 (6a94e87) into main (1f265b5) will decrease coverage by 4.23%. The diff coverage is 81.69%.

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   91.01%   86.77%   -4.24%     
==========================================
  Files           4        5       +1     
  Lines          89      121      +32     
  Branches       14       19       +5     
==========================================
+ Hits           81      105      +24     
- Misses          8       16       +8     

Impacted Files	Coverage Δ
...cyInjection/Builder/MediatRConfigurationBuilder.cs	71.11% <71.11%> (ø)
....DependencyInjection/ContainerBuilderExtensions.cs	87.50% <100.00%> (+4.16%)	:arrow_up:
...s.Autofac.DependencyInjection/KnownHandlerTypes.cs	100.00% <100.00%> (ø)
...utofac.DependencyInjection/MediatRConfiguration.cs	100.00% <100.00%> (ø)
...sions.Autofac.DependencyInjection/MediatRModule.cs	97.22% <100.00%> (-0.61%)	:arrow_down:

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