feat(ec2): Ensure EC2 launch templates do not assign public IPs

[MarioRgzLpz]

Context

This check verifies whether Amazon EC2 launch templates are configured to assign public IP addresses to network interfaces upon launch. The check fails if an EC2 launch template is set to assign a public IP address to network interfaces or if any network interface has a public IP address.

Description

Added ec2_launch_template_no_public_ip check with metadata and respective unit tests.

Checklist

• Are there new checks included in this PR? Yes
  • If so, do we need to update permissions for the provider? No
• [X] Review if the code is being covered by tests.
• [X] Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings

License

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

[sergargar]

Can we also check the second part of the check? "The control fails if an EC2 launch template is configured to assign a public IP address to network interfaces or if there is at least one network interface that has a public IP address."