Added singleton registration functionality

[JSkimming]

Closes #13

[codecov-io]

Codecov Report

Merging #25 into master will decrease coverage by 0.07%.
The diff coverage is 99.32%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
- Coverage     100%   99.92%   -0.08%     
==========================================
  Files          44       49       +5     
  Lines        1143     1267     +124     
  Branches      209      225      +16     
==========================================
+ Hits         1143     1266     +123     
- Misses          0        1       +1

Impacted Files	Coverage Δ
src/Abioc/ConstructionContext.cs	100% <ø> (ø)	⬆️
...ioc/Composition/Compositions/FactoryComposition.cs	100% <100%> (ø)	⬆️
...mposition/Visitors/SingletonRegistrationVisitor.cs	100% <100%> (ø)
...ation/SingletonRegistrationCompositionExtension.cs	100% <100%> (ø)
...bioc/Registration/RegistrationSetup.WithContext.cs	100% <100%> (ø)	⬆️
.../Abioc/Composition/Compositions/CompositionBase.cs	100% <100%> (ø)	⬆️
src/Abioc/Composition/VisitorManager.cs	100% <100%> (ø)	⬆️
src/Abioc/Composition/CodeComposition.cs	100% <100%> (ø)	⬆️
src/Abioc/ConstructionContextExtensions.cs	100% <100%> (ø)
...omposition/Compositions/TypedFactoryComposition.cs	100% <100%> (ø)	⬆️
... and 9 more

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