Added delete workgroup option; added additional logging option

[amazonchris]

*Issue: https://github.com/aws-samples/coast-grafana-cost-intelligence-dashboards/issues/9

Description of changes:

• Added recursive delete for Athena Workgroup, to solve CFN delete resource issue
• Added PublishCloudWatchMetricsEnabled to push additional Cloudwatch metrics which is useful for the Cost of Coast dashboard

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