Move resource annotations into separate package

[bart-degreed]

This enables to reference just JsonApiDotNetCore.Annotations, instead of the full package, in solutions where the models are in a shared project, separate from the API project.

As it turns out, NotMappedAttribute is defined in assembly System.ComponentModel.Annotations, so it is unrelated to EF Core, therefore we can keep it.

Closes #730.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• Documentation updated
• N/A: Created issue to update Templates: {ISSUE_NUMBER}

[codecov]

Codecov Report

Merging #1127 (2253f83) into master (9c9a4f2) will increase coverage by 0.04%.
The diff coverage is 84.15%.

@@            Coverage Diff             @@
##           master    #1127      +/-   ##
==========================================
+ Coverage   89.41%   89.45%   +0.04%     
==========================================
  Files         245      242       -3     
  Lines        7294     7209      -85     
==========================================
- Hits         6522     6449      -73     
+ Misses        772      760      -12     

Impacted Files	Coverage Δ
...NetCoreExample/Controllers/NonJsonApiController.cs	0.00% <0.00%> (ø)
...NetCoreExample/Controllers/OperationsController.cs	0.00% <0.00%> (ø)
...ples/JsonApiDotNetCoreExample/Data/AppDbContext.cs	0.00% <0.00%> (ø)
...otNetCoreExample/Definitions/TodoItemDefinition.cs	0.00% <0.00%> (ø)
...Examples/JsonApiDotNetCoreExample/Models/Person.cs	0.00% <0.00%> (ø)
...rc/Examples/JsonApiDotNetCoreExample/Models/Tag.cs	0.00% <0.00%> (ø)
...amples/JsonApiDotNetCoreExample/Models/TodoItem.cs	0.00% <0.00%> (ø)
src/Examples/JsonApiDotNetCoreExample/Program.cs	0.00% <0.00%> (ø)
...Core/AtomicOperations/MissingTransactionFactory.cs	0.00% <0.00%> (ø)
...sonApiDotNetCore/Diagnostics/CascadingCodeTimer.cs	0.00% <0.00%> (ø)
... and 354 more

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