EKS: AddOn VPC CNI: Enable Security Group for Pods features

### Describe the feature

Currently the EKS Addon VPC CNI does not have an option to enable the necessary flags to use Security Group for Pods feature. Therefore if you use the Addon, you would have to manually patch the VPC CNI. This should rather be an option to activate directly in the Addon itself.

### Use Case

Use Security Group for Pods with EKS without having to manually patch VPC CNI.

### Proposed Solution

Add the ability to set feature flags for VPC CNI Addon.

### Other Information

_No response_

### Acknowledgements

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

### CDK version used

2.40.0

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

EKS 1.24

Start by locating the EKS Addon VPC CNI construct and the configuration path for its feature flags. Confirm which flags are required for Security Group for Pods and verify that the Addon can expose them without manual VPC CNI patching; done means the requested feature flags can be enabled directly through the Addon.

Written by the indexing model from the issue text.