Support Uri and Version objects in resource models

[bkoelman]

Because System.Text.Json supports serializing Version and Uri objects, it would be interesting to see if we can make the following work:

public class ExampleResource : IIdentifiable<long>
{
    [Attr]
    public Version LatestVersion { get; set; }

    [Attr]
    public Uri HelpLink { get; set; }
}

At the minimum, this requires:

• Updates to RuntimeTypeConverter (used for query strings and expressions)
• ASP.NET ModelState binding/validation support
• EF Core support https://stackoverflow.com/questions/5037022/map-system-uri-using-entity-framework-fluent-api, https://github.com/dotnet/efcore/issues/12727
• PostgreSQL support?

Test coverage:

• Using these types in JSON request/response bodies, including database roundtrip
• ModelState validation on incoming request bodies
• Filters in query strings (including greater/less-than for versions), sorting