feat(logs): add metric methods for log group IncomingLogEvents and IncomingBytes

[michelle-wangg]

Issue

Closes #30034

Reason for this change

• Create alarms on log ingestion to ensure it is working

Description of changes

• Add metric methods for log group IncomingLogEvents and IncomingBytes, similar to existing metric methods like metricInvocations on Lambda functions.

Description of how you validated changes

• validated with new unit tests and a new integration test

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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

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[GavinZZ]

Nice work. Left some comments.

[GavinZZ]

Suggested change

	public metric(_metricName: string, _props?: cloudwatch.MetricOptions): cloudwatch.Metric {
	public metric(metricName: string, props?: cloudwatch.MetricOptions): cloudwatch.Metric {

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 451f2ab
• Result: SUCCEEDED
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