feat: unmapped source property diagnostic

[latonz]

New diagnostic RMG020 Source property is not mapped to any target property which allows to configure a strict mapping mode

[codecov-commenter]

Codecov Report

Merging #77 (bec3b48) into main (e8351f1) will increase coverage by 0.19%.
The diff coverage is 98.36%.

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   89.44%   89.63%   +0.19%     
==========================================
  Files          73       74       +1     
  Lines        2368     2412      +44     
  Branches      304      305       +1     
==========================================
+ Hits         2118     2162      +44     
  Misses        183      183              
  Partials       67       67              

Impacted Files	Coverage Δ
...gs/PropertyMappings/ConstructorParameterMapping.cs	58.53% <83.33%> (+1.03%)	⬆️
...MappingBuilder/NewInstanceMappingBuilderContext.cs	100.00% <100.00%> (ø)
...Builder/NewInstanceObjectPropertyMappingBuilder.cs	85.09% <100.00%> (ø)
...ors/MappingBuilder/ObjectPropertyMappingBuilder.cs	100.00% <100.00%> (ø)
...pingBuilder/ObjectPropertyMappingBuilderContext.cs	100.00% <100.00%> (ø)
...Riok.Mapperly/Diagnostics/DiagnosticDescriptors.cs	100.00% <100.00%> (ø)
src/Riok.Mapperly/Helpers/SymbolExtensions.cs	95.12% <100.00%> (+1.00%)	⬆️

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[github-actions]

🎉 This PR is included in version 2.3.0-next.1 🎉

The release is available on:

• v2.3.0-next.1
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 2.3.0 🎉

The release is available on:

• v2.3.0
• GitHub release

Your semantic-release bot 📦🚀