feat(ec2): network interface definitions for launch templates

[watersry]

This PR implements basic functionality for defining network interfaces as part of Launch Template.

I'm just reviving https://github.com/aws/aws-cdk/pull/29875 to try and get those changes merged. All the work was done by @pasiorovuo, I made some modifications to try and address the feedback from his original PR.

Issue # (if applicable)

Fixes https://github.com/aws/aws-cdk/issues/14494

Reason for this change

Current Launch Template L2 is missing the ability to define multiple interfaces, their subnets etc. This functionality is required in advanced scenarios where instances need multiple public IP addresses or need to be multi-homed etc. Description of changes

Multiple new types have been introduced in packages/aws-cdk-lib/aws-ec2/lib/launch-template.ts. Many of them are just renamed extends of the ec2-generated types. This made sense as the Cloudformation type definition is suitable, but I'm a bit uncertain if this violates the design requirement Do not “leak” the details or types of the CFN layer when defining your construct API.

Main type is NetworkInterface which defines the attributes for the interfaces. Additional changes are in LaunchTemplate constructor to accommodate the new functionality.

README has been updated to include a simple usage example.

Description of how you validated changes

A single test has been added. I have also verified the implementation by creating stacks in different configurations and deployed them. There too many combinations to check them all, so only a subset has been tested, unfortunately.

Checklist

• [x] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: c29affdde5513952654da259383134770a6953f3
• Result: SUCCEEDED
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