(aws-rds): support lookup method for Aurora `DatabaseCluster`

[mazyu36]

Describe the feature

Related Issue: #31720

Implement a lookup function for RDS DatabaseCluster similar to the existing DatabaseInstance.fromLookup functionality.

This allows users to fetch an Aurora RDS cluster reference by identifier rather than having to manually provide all connection details.

Use Case

Currently, to reference an existing Aurora cluster, users need to provide many details manually using DatabaseCluster.fromDatabaseClusterAttributes().

This is cumbersome and error-prone, especially when these values can change over time.

Proposed Solution

Add lookup method that retrieves all necessary attributes through the CDK context provider:

  const cluster = DatabaseCluster.fromLookup(stack, "AuroraCluster", {
    clusterIdentifier: "my-aurora-cluster"
  });

Other Information

• Implementation follows the pattern established by DatabaseInstance.fromLookup
• Added unit and integration tests to verify functionality

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS CDK Library version (aws-cdk-lib)

2.161.0

AWS CDK CLI version

2.1019.1

Environment details (OS name and version, etc.)

OSX

[pahud]

Hi @mazyu36,

Thank you for this well-structured feature request! This is indeed a valuable addition that would provide consistency with the existing DatabaseInstance.fromLookup() method.

Your proposed API design looks perfect and follows the established patterns in the CDK:

const cluster = DatabaseCluster.fromLookup(stack, "AuroraCluster", {
 clusterIdentifier: "my-aurora-cluster"
});

This would be a great contribution that addresses a legitimate developer pain point. Thank you for your great job on #34849!

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