Merge master into openapi

[bkoelman]

Merges the master branch into openapi, which provides enhanced support for JSON:API extensions.

[codecov]

Codecov Report

Attention: Patch coverage is 89.41176% with 9 lines in your changes missing coverage. Please review.

Project coverage is 90.50%. Comparing base (9657947) to head (462a6e3).
Report is 9 commits behind head on openapi.

Files with missing lines	Patch %	Lines
...lization/JsonConverters/ResourceObjectConverter.cs	92.50%	1 Missing and 2 partials ⚠️
...NetCore/AtomicOperations/DefaultOperationFilter.cs	80.00%	0 Missing and 2 partials ⚠️
.../JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs	33.33%	0 Missing and 2 partials ⚠️
...c/JsonApiDotNetCore/Middleware/JsonApiMediaType.cs	88.88%	1 Missing ⚠️
...DotNetCore/Middleware/JsonApiMediaTypeExtension.cs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           openapi    #1630   +/-   ##
========================================
  Coverage    90.49%   90.50%           
========================================
  Files          458      459    +1     
  Lines        13861    13915   +54     
  Branches      2147     2156    +9     
========================================
+ Hits         12544    12594   +50     
- Misses         896      897    +1     
- Partials       421      424    +3     

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