feat(internet-exposed): Improve publicly accessible checks to include targets of ELBs

[abant07]

Context

Currently, we are checking if resources are internet facing and then flagging it as a failed test to the user, however, there is possibility that the user has configured security groups for their resources but have forgotten to configure for their load balancers. This can potentially be a security threat as anyone from the internet can access their load balancer and have the ability to hack their resources.

Description

No dependencies have been added, however, I have added 2 checks for EC2, 1 check for Lambda, and 1 check for ECS to make sure that ELBs and ELBv2s are either internal or if they are internet facing they should have security groups.

License

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