SignalR - Getting user claims through dependency injection

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the bug

How can I get current user claims outside of a `Hub`?

My usecase is a multy tenant application where EF Core `DbContext` is seeded with a `TenantId` value that in the case of a HTTP request is being extracted within `DbContext` constructor from current user claims by injecting `IHttpContextAccessor `into the `DbContext` constructor and then finding the necessary user claim as follows `IHttpContextAccessor.HttpContext.User.Claims.FirstOrDefault(x => x.Type == "tenantId").Value` but I could not find a way of doing an analogous approach in the case of SignalR Hub method call, that is, I could not find a way of injecting current user claims via dependency injection in the case of a SignalR Hub method call in a similar way like it is possible in the conext of HTTP call (as I have described above). So the question is whether there is a way to access `HubCallerContext` or at least `ClaimsPrincipal` through a service outside of a Hub?

The only related info I could find is the following comment from @analogrelay ([here is the link to it](https://github.com/dotnet/aspnetcore/issues/12535#issuecomment-514900103)):

> This is by design. There is no active HTTP request in your application when using Azure SignalR.
If what you're trying to do is access claims on the user, those should have been copied over to the HubCallerContext.User property (accessible via the Context property on your Hub).

### Expected Behavior

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### Steps To Reproduce

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### Exceptions (if any)

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### .NET Version

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### Anything else?

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