Add security checks to tfsec that detect overly permissive firewall configurations for DigitalOcean resources.

Add security checks to tfsec that detect overly permissive firewall configurations for DigitalOcean resources.: a task in LegoFlow-SWE (Harbor dataset). Currently there are no rules that flag firewall rules with wide-open CIDR ranges in digitalocean firewall resources. This can lead to unintended…