Merge master into openapi

[bkoelman]

Merges the master branch into openapi, which provides third-party JSON:API extensions support.

[codecov]

Codecov Report

Attention: Patch coverage is 90.53498% with 23 lines in your changes missing coverage. Please review.

Project coverage is 90.49%. Comparing base (2fd9263) to head (32f7515).
Report is 4 commits behind head on openapi.

Files with missing lines	Patch %	Lines
...c/JsonApiDotNetCore/Middleware/JsonApiMediaType.cs	92.95%	5 Missing ⚠️
...iDotNetCore/Middleware/JsonApiContentNegotiator.cs	95.29%	2 Missing and 2 partials ⚠️
...c/JsonApiDotNetCore/Middleware/JsonApiExtension.cs	73.33%	3 Missing and 1 partial ⚠️
.../JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs	88.23%	2 Missing and 2 partials ⚠️
...uckle/JsonApiActionDescriptorCollectionProvider.cs	57.14%	1 Missing and 2 partials ⚠️
src/JsonApiDotNetCore/CollectionExtensions.cs	60.00%	1 Missing and 1 partial ⚠️
...washbuckle/JsonApiRequestFormatMetadataProvider.cs	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           openapi    #1624      +/-   ##
===========================================
- Coverage    90.55%   90.49%   -0.06%     
===========================================
  Files          455      458       +3     
  Lines        13729    13861     +132     
  Branches      2116     2147      +31     
===========================================
+ Hits         12432    12544     +112     
- Misses         882      896      +14     
- Partials       415      421       +6     

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