(aws-ec2): Add LicenseSpecifications property to launchtemplate and instance

### Describe the feature

At the moment setting LicenseSpecifications via the Launchtemplate construct is not implemented.
https://github.com/aws/aws-cdk/blob/master/packages/%40aws-cdk/aws-ec2/lib/launch-template.ts#L640

### Use Case

We use EKS managed node groups with the autoscaler and want to track our license consumption over multiple node groups with the license manager.

### Proposed Solution

It is just a property that needs to be mapped from the construct to Cloudformation.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-launchtemplate-launchtemplatedata.html#cfn-ec2-launchtemplate-launchtemplatedata-licensespecifications

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-instance.html#cfn-ec2-instance-licensespecifications

### Other Information

Our current workaround involves addPropertyOverride on the underlying CfnLaunchTemplate.

### Acknowledgements

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

### CDK version used

1.148.0

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

not relevant to the issue

Start in packages/@aws-cdk/aws-ec2/lib/launch-template.ts around line 640 and trace how Launchtemplate properties reach the underlying CfnLaunchTemplate. Compare the CloudFormation LaunchTemplateData and Instance LicenseSpecifications documentation linked in the issue, then inspect the instance construct path. Done means both constructs expose and map LicenseSpecifications without requiring addPropertyOverride.

Written by the indexing model from the issue text.