use EMF in lambda to send custom metrics

[zxkane]

Describe the feature

EMF is a feature of CloudWatch to send custom metrics that is an asynchorinzed way not blocking the business logic if something wrong happened in CloudWatch.

Use Case

Proposed Solution - Optional

use Powertools metrics API

https://docs.powertools.aws.dev/lambda/typescript/latest/core/metrics/#creating-metrics

Other Information

Notes:

• this feature has an UI update
• this feature contains an implementation guide update

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This is a 🚀 Feature Request