feat: add metric integrations from telegraf

[bryan-stclab]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• DevOps process (non-breaking change which improves efficiency and reliability for CI/CD)
• Documentation only

What this PR does / why we need it:

• Metric data that can affect scale-in and scale-out is collected for AWS Lambda, Amazon DynamoDB, Amazon EC2, Amazon EMR, Amazon ECS, and AWS WAF using telegraf from Amazon CloudWatch.
• Metric data that can affect scale-in and scale-out is collected for Google Cloud Functions, Google Cloud Run, and GCP MIG using telegraf from stackdriver.
• Metric data that can affect scale-in and scale-out is collected for Azure Functions and Azure VMSS using telegraf from prometheus.

Which issue/s this PR fixes

#181

How Has This Been Tested?

I have verified the actual collection of metric data from each of Amazon CloudWatch, stackdriver, and prometheus.

Checklist: