(Do not merge) Add support for insight metrics

[cfln123]

Resources:
  KafkaTopic1:
  - Id: ********
    ClusterName: *******
  
Templates:
  KafkaTopic1:
    Inherit: Base
    AVGMessagesInPerSec:
      Threshold: 5
      AlarmAction: Warning
      Metrics:
        - Expression: "SELECT AVG(MessagesInPerSec) FROM \"AWS/Kafka\" WHERE Topic = '*********' AND \"Cluster Name\" = '********'"
          Label: "Query1" # optional
          Id: "q1" # optional
          Period: 60 # optional