Ability to use Security Group Name and/or tags in Security Group Policy

**Is your feature request related to a problem? Please describe.**
Security Groups are tied to VPC which means you cannot reuse Security Group Policy on clusters belonging to different VPC.

**Describe the solution you'd like**
SGP should allow specifying security groups using security group name and/or tags.

Start by locating the controller code that handles Security Group Policy and trace how security groups are currently selected for EKS clusters. Review the AWS VPC security-group APIs involved in names and tags, then define behavior for policies reused across VPCs. Done means policies can resolve security groups by name and/or tags, with coverage for the supported selection cases.

Written by the indexing model from the issue text.