feat(rds): Add logRetentions property to clusters and instances

[snaksa]

Add a logRetentions property to the Cluster and Instance objects to be able to get the generated CloudWatch LogGroup ARN. The type of the field is {[key:string]: logs.LogRetention} and allows accessing the LogGroup for a certain log type provided through the cloudwatchLogsExports property.

// Exporting logs from an instance
const instance = new rds.DatabaseInstance(this, 'Instance', {
  engine: rds.DatabaseInstanceEngine.postgres({
    version: rds.PostgresEngineVersion.VER_15_2,
  }),
  vpc,
  cloudwatchLogsExports: ['postgresql'], // Export the PostgreSQL logs
  // ...
});

// Access the generated LogGroup ARN for the "postgresql" log type
const postgresqlLogGroupArn = instance.logRetentions.postgresql.logGroupArn;

Closes #20358.

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[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[snaksa]

Exemption Request: I could not find any existing integration tests. Please let me know in case I missed something.

[scanlonp]

@snaksa The RDS integ tests live here https://github.com/aws/aws-cdk/tree/main/packages/%40aws-cdk-testing/framework-integ/test/aws-rds/test ! This looks good, a couple integ tests and we should be good to go.

[snaksa]

@scanlonp Does this change need an integration test? It just exposes the generated LogRetention records and is not making any changes to the final synthesized result.

[aws-cdk-automation]

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[aws-cdk-automation]

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