feat(ecr): grantRead on repositories

[kaizencc]

Adds a grantRead method with ecr:DescribeRepositories and ecr:DescribeImages permissions.

The use case is for something like cdk-assets, which tries to look up the repository / image name as part of the publishing step (so it doesn't publish a duplicate).

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[gitpod-io]

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: adc7cd2
• Result: SUCCEEDED
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[mergify]

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).