aws-cdk-lib/aws-ec2: Add DynamoDB Streams Endpoint to InterfaceVpcEndpointAwsService Class

### Describe the feature

DynamoDB launched [PrivateLink support for Streams on March 26th](https://aws.amazon.com/about-aws/whats-new/2025/03/amazon-dynamodb-streams-apis-aws-privatelink/). This needs accommodating in the [aws-ec2.vpc-endpoint InterfaceVpcEndpointAwsService Class](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ec2/lib/vpc-endpoint.ts#L363)

### Use Case

This will help make it easier for customers to adopt DynamoDB Streams with private VPC connectivity using CDK

### Proposed Solution

Add `public static readonly DYNAMODB_STREAMS = new InterfaceVpcEndpointAwsService('dynamodb-streams');

### Other Information

_No response_

### Acknowledgements

- [x] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS CDK Library version (aws-cdk-lib)

v2.195.0

### AWS CDK CLI version

2.1016.0

### Environment details (OS name and version, etc.)

MacOS

Open packages/aws-cdk-lib/aws-ec2/lib/vpc-endpoint.ts at the InterfaceVpcEndpointAwsService class and review the neighboring service definitions. Add the requested DynamoDB Streams endpoint entry, then verify that the class exposes the new service name consistently with the existing interface endpoint services.

Written by the indexing model from the issue text.