Aws codestarnotifications notification rule to support AWSChatBot as a target

AWS CodeStar Notifications support AWSChatBot integration on the AWS GUI. However, in terraform the aws_codestarnotifications_notification_rule resource only seems to support SNS as a target. Can AWSChatBot be enabled as a valid target.

This is quite handy cause it means we don’t need to maintain extra Lambda’s etc when doing COdeBuild notification to Slack and Chime as AWSCHatBot handles this for us.