.NET 8: MapIdentityApi<TUser>()

[Rick-Anderson]

See MapIdentityApi<TUser>()

Related: #30066

The main goal of the MapIdentityApi is to make it easy for developers to use ASP.NET Core Identity for authentication in JavaScript-based single page apps (SPA) or Blazor apps.

Since it's for Blazor app, assigning to @guardrex. If you don't want this, let me know.

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Associated WorkItem - 159474