Extend AspNetUserClaimLayoutRenderer to handle multi-values

[snakefoot]

Inherit from AspNetLayoutMultiValueRendererBase and support outputting all assigned claim-values:

                foreach (var claim in ctx.Principal.Claims)
                {
                    Console.WriteLine($"{claim.Type} - {claim.Value}");
                }

See also: https://nestenius.se/2023/06/02/debugging-jwtbearer-claim-problems-in-asp-net-core/

[bakgerman]

I will examine this

[bakgerman]

PR submitted