Fix Issue with Serializing Type When Using System.Text.Json

[KyleMcMaster]

Description of Changes:

Fixes #91
Fixes issue with lack of support for serialization of Type when using System.Text.Json's serializer by removing the property from the exported json altogether. Unit tests show output of serialization for reference.

Pros:

• Fixes issue
• Makes Type an expression which simplifies Result's available API and reduces code (which appeared to be unused based on Samples, Docs, and Tests).

Cons:

• Adds additional but compatible dependency on System.Text.Json to core Ardalis.Result for .NET Standard users. This is already a "baked in" dependency in .NET 7 version.

https://www.nuget.org/packages/System.Text.Json/7.0.3#supportedframeworks-body-tab

Did you add tests?

• - Yes
• - No

If no, why not?

N/A

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Ardalis.Result	90%	93%	77	✔
Summary	90% (171 / 191)	93% (13 / 14)	77	✔