Refactor OpenAPI integration

[glen-84]

Summary of the changes (Less than 80 chars)

• Refactored the OpenAPI integration.

🆕 New features:

• Optional and configurable query and mutation conventions
• Union results
• Deprecation
• Default values
• Tags
• Support for different parameter serialization styles
• Support for OpenAPI links
• Caching of GET requests to the same request URI, within the context of a single GraphQL request

❓To be considered:

• Should Utf8JsonWriterHelper (or something similar) be moved to a shared location? (write JSON from an IValueNode)
• Will tag naming restrictions be relaxed enough to make this feature worthwhile?

⚠️ Not backwards-compatible.

[github-actions]

Qodana for .NET

It seems all right 👌

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[codecov]

Codecov Report

Attention: Patch coverage is 77.50000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 79.58%. Comparing base (f7dfae1) to head (b2eb239).

Files	Patch %	Lines
...te.OpenApi/Properties/OpenApiResources.Designer.cs	76.92%	6 Missing ⚠️
...tChocolate.OpenApi/Helpers/Utf8JsonWriterHelper.cs	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7088      +/-   ##
==========================================
- Coverage   79.68%   79.58%   -0.11%     
==========================================
  Files        2632     2663      +31     
  Lines      131383   132582    +1199     
==========================================
+ Hits       104692   105509     +817     
- Misses      26691    27073     +382     

Flag	Coverage Δ
unittests	79.58% <77.50%> (-0.11%)	⬇️

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[michaelstaib]

I think we should create a lib that deals with these things. we have this code at least 3 times now .... it does not matter for this PR ... but we should create a core lib dealing with naming and reformatting names etc...