Added setting UsePolymorphicSerialization

[ryanheath]

Fixes #459 and Unknown subtype causes Stackoverflow exception at deserialization

Loosely based on Add support for STJ-native C# code gen

When UseSystemTextJsonPolymorphicSerialization is set to true
a CustomTemplateFactory is used that overrides the NSwag DefaultTemplateFactory behavior.
The STJ polymorphic attributes are rendered instead of NSwag own polymorphic attributes.

[christianhelle]

@ryanheath Thanks for taking the time to investigate and implement this. I'll start reviewing this immediately

[christianhelle]

@all-contributors please add @ryanheath for code

[allcontributors]

@christianhelle

I've put up a pull request to add @ryanheath! 🎉

[christianhelle]

@ryanheath I just have a few minor suggestions, but all-in-all this looks great!

[ryanheath]

The tests are still failing because of a static template dictionary deep down in the nwag or nschema sources.
I'll see want can be done.

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[ryanheath]

I have added a lot more override and custom implementation of NSwag/NSchema generators and models.
NSwag/NSchema is not extensible friendly regarding this point, or I must have overlooked an easy way to access settings in the template files ... 😅

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 40 lines in your changes missing coverage. Please review.

Project coverage is 85.95%. Comparing base (f7c6865) to head (d9f050e).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Refitter.Core/CustomCSharpClientGenerator.cs	59.15%	26 Missing and 3 partials ⚠️
src/Refitter.Core/CSharpClientGeneratorFactory.cs	79.24%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #462       +/-   ##
===========================================
- Coverage   96.04%   85.95%   -10.09%     
===========================================
  Files          73       50       -23     
  Lines        3991     2769     -1222     
===========================================
- Hits         3833     2380     -1453     
- Misses        116      357      +241     
+ Partials       42       32       -10     

Flag	Coverage Δ
unittests	85.95% <75.00%> (-10.09%)	⬇️

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[christianhelle]

Great work @ryanheath

[christianhelle]

I have added a lot more override and custom implementation of NSwag/NSchema generators and models. NSwag/NSchema is not extensible friendly regarding this point, or I must have overlooked an easy way to access settings in the template files ... 😅

Yeah, I agree. It looks needlessly complicated and harder than it should be.

Let's merge this in

[ryanheath]

Thank you @christianhelle!

[ryanheath]

@christianhelle what else should we do to get a new (pre) release nuget?

[christianhelle]

@christianhelle what else should we do to get a new (pre) release nuget?

I can create a pre-release now as it is so that you can use it

[christianhelle]

@ryanheath I was planning to update the docs tonight but then I can just do another pre-release with the new docs