Add documentation for integrating Blazor Web Apps with the Microsoft Identity Platform

[halter73]

I'm filing this issue to track adding documentation for integrating Blazor Web Apps with the Microsoft Identity Platform. It should be similar to the existing Blazor Web App with OIDC docs. But instead of relying on the generic OIDC authentication handler, it should use Microsoft.Identity.Web and call AddMicrosoftIdentityWebApp.

I opened dotnet/blazor-samples#355 which is a sample that demonstrates how you can use AddMicrosoftIdentityWeb in Blazor on .NET 9 RC 1.

@guardrex

[github-actions]

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