feat(dynamodb): add metrics for dynamodb table

[intercept6]

Pull Request Checklist

• Testing
  • Unit test added (prefer not to modify an existing test, otherwise, it's probably a breaking change)
  • CLI change?: coordinate update of integration tests with team
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---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

Commit Message

feat(dynamodb): add metrics for dynamodb table (#6149)

Add metric* methods on the Table class.

[aws-cdk-automation]

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[RomainMuller]

Thank you for this contribution!

I have corrected a tiny bug in it (one of the metric names was wrong!), and increased test coverage.

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