Synapse should be able to send events to a sink channel

[anoop2811]

For all activities that are performed by the neurons, anything that is printed by them to the stdout or stderr should be sent to a channel (internal go channel as MVP). A logging notifier could read from it and send to a configured logger.

In the future we should need to add support for multiple sink channels like SQS or Kafka or RabbitMQ which could be used by consumers to analyze and notify on.