Support safe transport name when binding configuration

[mburumaxwell]

Some hosts do not allow certain characters for ENV vars but we know they all support alphanumeric and underscore. For example, Azure Container Instances does not allow hyphens in ENV vars while Azure Container Apps does.

This PR allows binding configuration for a transport from a section using a safe name (EventBus:Transports:{safeName}) in addition to the default one (EventBus:Transports:{name}). For example, for Azure Service Bus, this binds to EventBus:Transports:azureservicebus and EventBus:Transports:azure-service-bus.

The IEventBusConfigurator.Configure<TOptions>(IConfiguration configuration, TOptions options) where TOptions : EventBusTransportOptions function is always called for the default name but it is only called for the safe name if there is configuration found.