Describe the feature

Specify port number of the Neptune cluster.

Use Case

We can configure the port number of Neptune cluster but CDK L2 construct cannot configure this.

Proposed Solution

Add port property to DatabaseClusterProps and set DBPort to the port value.
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-neptune-dbcluster.html#cfn-neptune-dbcluster-dbport

Other Information

No response

Acknowledgements

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

CDK version used

2.150.0

Environment details (OS name and version, etc.)

irrelevant