(aws-ec2): Add DataSync InterfaceVpcEndpointAwsService

Add a `InterfaceVpcEndpointAwsService` for the DataSync service.

### Use Case

I am needing to add a VPC endpoint for the DataSync service. I do not see this option available so once I deploy the VPC, I am having to manually add this endpoint.

### Proposed Solution

**vpc-endpoint.ts**
```
InterfaceVpcEndpointAwsService.DATASYNC = new InterfaceVpcEndpointAwsService('datasync');
```

### Other

I would attempt to do this myself but I am a bit unclear to what ports I need to specify. The [docs](https://docs.aws.amazon.com/datasync/latest/userguide/datasync-network.html) show a few different options for this and I am not sure what the correct approach would be. So due to that, I will not attempt to do this myself.

* [ ] :wave: I may be able to implement this feature request
* [ ] :warning: This feature might incur a breaking change

---

This is a :rocket: Feature Request

Start in vpc-endpoint.ts by reviewing the existing InterfaceVpcEndpointAwsService entries, then check the linked AWS DataSync networking documentation for the endpoint service name and required configuration. Done means the DataSync service is available through the enum and the existing endpoint usage pattern supports creating it without manual VPC changes.

Written by the indexing model from the issue text.