aws_cdk.aws_ec2 NatInstanceProvider: missing require_imdsv2

### Describe the feature

Can we get the require_imdsv2 parameter added to the aws_cdk.aws_ec2 NatInstanceProvider resource?
This was resolved for EC2 and ASG here: Support setting EC2 instance metadata to require token (IMDSv2) #5137

#16051
#16052

### Use Case

The AWS Foundational Security Best Practices v1.0.0 for Security Hub will produce a finding for the NAT instances under EC2.8: EC2 instances should use Instance Metadata Service Version 2 (IMDSv2)

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

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

### CDK version used

2.61.1 (build d319d9c)

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

WSL: Ubuntu 20.04.5 LTS (Focal Fossa)

The issue concerns NatInstanceProvider in aws_cdk.aws_ec2; compare the earlier EC2 and ASG implementation referenced by #5137. Trace that provider’s existing configuration and tests, then verify require_imdsv2 can be supplied and produces the intended IMDSv2 setting for NAT instances.

Written by the indexing model from the issue text.