feat: queryable support for user implemented mappings

[latonz]

Closes #338

[codecov-commenter]

Codecov Report

Merging #348 (bdc78c8) into main (dce4b42) will increase coverage by 0.28%.
The diff coverage is 94.04%.

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@@            Coverage Diff             @@
##             main     #348      +/-   ##
==========================================
+ Coverage   91.71%   92.00%   +0.28%     
==========================================
  Files         109      119      +10     
  Lines        3379     3763     +384     
  Branches      438      507      +69     
==========================================
+ Hits         3099     3462     +363     
- Misses        189      206      +17     
- Partials       91       95       +4     

Impacted Files	Coverage Δ
src/Riok.Mapperly.Abstractions/MapEnumAttribute.cs	100.00% <ø> (ø)
...appings/NewInstanceObjectFactoryPropertyMapping.cs	100.00% <ø> (ø)
...escriptors/Mappings/ObjectPropertyMethodMapping.cs	90.00% <ø> (ø)
...riptors/MappingBuilders/QueryableMappingBuilder.cs	68.42% <68.42%> (ø)
...Descriptors/Mappings/EnumFromStringParseMapping.cs	73.68% <73.68%> (ø)
...criptors/Mappings/PropertyMappings/PropertyPath.cs	89.06% <80.00%> (-3.60%)	⬇️
src/Riok.Mapperly/Helpers/SymbolExtensions.cs	86.56% <81.81%> (+0.85%)	⬆️
...iptors/MappingBuilders/DictionaryMappingBuilder.cs	79.51% <83.33%> (+0.50%)	⬆️
src/Riok.Mapperly/Descriptors/WellKnownTypes.cs	87.23% <83.87%> (-8.92%)	⬇️
...iptors/MappingBuilders/EnumerableMappingBuilder.cs	92.53% <90.90%> (-0.73%)	⬇️
... and 44 more

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[github-actions]

🎉 This PR is included in version 2.8.0-next.2 🎉

The release is available on:

• GitHub release
• v2.8.0-next.2

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