CloudWatch: Add AWS Transfer metrics and dimension (#41168)
CloudWatch: Add AWS Transfer metrics and dimension (#41168)

What this PR does / why we need it:
Adding AWS Transfer metics according to:
https://docs.aws.amazon.com/transfer/latest/userguide/monitoring.html#metrics

Which issue(s) this PR fixes:
No issue

Special notes for your reviewer:
Based on AWS documentation only, I didn't tried to monitor AWS Transfer myself
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