#281 Access to underlying service collection in builder

[EtherZa]

#281

Adds an overload to MessageBusBuilder.AddAdditionalService to expose underlying IMessageConfiguration and IServiceCollection for finer control of service manipulation.

Sample usage:

public static IMessageBusBuilder WithOutbox(this IMessageBusBuilder builder)
{
   builder.AddAdditionalService((_, services) => 
   {
      ... // other services related to the outbox
      services.AddHostedService<OutboxPublishBackgroundService>();
      services.Replace(new ServiceDescriptor(typeof(IMessagePublisher), typeof(OutboxMessageRoutingPublisher), ServiceLifetime.Scoped));
  });

   return builder;
}

Although not included in the sample message, I suspect that there would be other times where having the message configuration may be useful but I am happy to remove it if there is an objection.

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