check aws explainabiliy

[haim-kermany]

after nacl is supported, explainability should work. additional support is needed for public/private subnets

• [x] support public subnets
• [x] detailed explain of public subnets
• [x] adding test infrastructure for aws explainability
• [x] check correctness of examples + adding interesting tests (html is a great platform for it)

[ShiriMoran]

for the 2nd bullet above, add examples:

1. Private subnet s.t. the path in/to external is being blocked in the subnet
2. Private subnet blocking both in egress or ingress
3. Public subnets enabling connection to the internet