AWS Cloud Collector - ECS - Add ServiceName discovery options

Hi Joe- Thanks for the suggestion!  The default ECS DataSource can be customized to additionally use ServiceName as a dimension, but since we currently don't discover service information when we discover a cluster, that service dimension would have to be hardcoded in the DataSource (and you'd need a new DataSource per service).  It might make more sense for us to see if we could discover services as instances for a cluster - does that align with what you'd want to see?