MapHub extension with custom hub hame

[greggnog]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I am trying to set up local development using an Azure Signalr instance in a way where developer APIs that handle incoming SignalR requests don't interfere with each other. I had the same issue with Azure Web Pubsub and it was addressed there with this PR (in response to a feature request): Azure/azure-sdk-for-net#47022

I tried using unique paths per machine when registering the hub (e.g. "/hub1", "/hub2"), but there was still interference.

Describe the solution you'd like

Adding extension method for specifying custom hub name:

public void Configure(IApplicationBuilder app)
{
    app.UseEndpoints(endpoint =>
    {
        endpoint.MapHub<SampleHub>("/sampleHubPath", "customHubName");
    });
}

Additional context

No response