Replace API for change tracking with NSwag to support atomic operations

[bkoelman]

This PR replaces the WithPartialAttributeSerialization extension method to support partial POST/PATCH with a new API, TrackChangesFor, which directly operates on the request document. This makes it possible to use partial updates in atomic:operations requests.

Example usage:

var updatePersonRequest = new UpdatePersonRequestDocument
{
    Data = new DataInUpdatePersonRequest
    {
        Id = "1",
        // Using TrackChangesFor to send "firstName: null" instead of omitting it.
        Attributes = new TrackChangesFor<AttributesInUpdatePersonRequest>(_apiClient)
        {
            Initializer =
            {
                FirstName = null,
                LastName = "Doe"
            }
        }.Initializer
    }
};

await ApiResponse.TranslateAsync(async () =>
    await _apiClient.PatchPersonAsync(updatePersonRequest.Data.Id, updatePersonRequest));
}

To accomplish this, the JsonApiDotNetCore.OpenApi.Client.NSwag package now includes custom NSwag liquid templates. It abuses the Prism class style to intercept INotifyPropertyChanged. Preliminary support for resource inheritance is included for upcoming changes.

Shipping liquid templates enables us to auto-generate the partial class to initialize JSON:API, so users can skip that step.

Closes #1577, closes #1673.

QUALITY CHECKLIST

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

[codecov]

Codecov Report

Attention: Patch coverage is 90.84967% with 14 lines in your changes missing coverage. Please review.

Project coverage is 90.40%. Comparing base (cdc6962) to head (fd1f6c4).

Files with missing lines	Patch %	Lines
...pi.Client.NSwag/BlockedJsonInheritanceConverter.cs	41.66%	7 Missing ⚠️
...piDotNetCore.OpenApi.Client.NSwag/JsonApiClient.cs	94.53%	2 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           openapi    #1684      +/-   ##
===========================================
- Coverage    90.41%   90.40%   -0.01%     
===========================================
  Files          458      461       +3     
  Lines        13984    14043      +59     
  Branches      2177     2190      +13     
===========================================
+ Hits         12643    12695      +52     
- Misses         910      913       +3     
- Partials       431      435       +4     

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