Docs: https://learn.microsoft.com/en-us/aspnet/signalr/
Azure SignalR Serverless: https://learn.microsoft.com/en-us/azure/azure-signalr/signalr-quickstart-azure-functions-csharp?tabs=in-process
AzureSignalR examples: https://github.com/aspnet/AzureSignalR-samples/blob/main/samples/QuickStartServerless/csharp-isolated/local.settings.template.json