add metricstream support

[rushmash91]

Fixes aws-controllers-k8s/community#2530

Description of changes:

• add support for metric stream resource

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

[ack-prow]

@rushmash91: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
cloudwatch-verify-attribution	2c9db37	link	false	/test cloudwatch-verify-attribution

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[a-hilaly]

Thanks @rushmash91
/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, rushmash91

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