Use System.Text.Json source generator

[bkoelman]

Closes #{ISSUE_NUMBER}

QUALITY CHECKLIST

• [ ] Changes implemented in code
• [ ] Complies with our contributing guidelines
• [ ] Adapted tests
• [ ] Documentation updated

[codecov[bot]]

Codecov Report

Merging #1170 (f760e8f) into master (0185311) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1170      +/-   ##
==========================================
- Coverage   92.58%   92.57%   -0.01%     
==========================================
  Files         241      242       +1     
  Lines        7700     7694       -6     
==========================================
- Hits         7129     7123       -6     
  Misses        571      571              

Impacted Files	Coverage Δ
...otNetCore/Serialization/Objects/AtomicReference.cs	100.00% <ø> (ø)
.../Serialization/Objects/ResourceIdentifierObject.cs	100.00% <ø> (ø)
...DotNetCore/Serialization/Objects/ResourceObject.cs	100.00% <ø> (ø)
...tNetCore/Serialization/Objects/SingleOrManyData.cs	100.00% <ø> (ø)
...Core/Serialization/Request/Adapters/BaseAdapter.cs	100.00% <ø> (ø)
...zation/Request/Adapters/ResourceIdentityAdapter.cs	100.00% <ø> (ø)
...n/Request/Adapters/ResourceIdentityRequirements.cs	100.00% <ø> (ø)
.../JsonApiDotNetCore/Configuration/JsonApiOptions.cs	100.00% <100.00%> (ø)
.../JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs	97.77% <100.00%> (ø)
...tNetCore/Queries/Internal/Parsing/IncludeParser.cs	95.83% <100.00%> (ø)
... and 2 more

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